SketchUp Expert for Australian Timber Frame Cabin

# Australian Timber-Framed 6 m x 3 m Cabin - SketchUp & Construction Drawings

## Project Overview

I need an experienced construction drafter to prepare a detailed SketchUp model and construction drawing set for a 6,000 mm x 3,000 mm timber-framed cabin in Victoria, Australia.

The design, dimensions, materials and construction approach are substantially determined. This is not an architectural concept or rendering job. I need a practical, buildable, engineer-ready drawing set reflecting the NCC and relevant Australian timber-framing standards.

The intended character is a simple, well-insulated Australian rural workshop/shed clad in reclaimed corrugated galvanised iron.

## Overall Building

* Footprint: approximately 6,000 mm x 3,000 mm.
* Conventional timber stud construction.
* Single-slope skillion roof falling from high front wall to low rear wall.
* Roof pitch: 15 degrees.
* Internal rear/low wall height: approximately 2,400 mm.
* Ceiling follows the roof line.
* Approximate internal front/high wall height: 3,200 mm, subject to final roof build-up.
* Front roof overhang: 1,000 mm.
* Rear roof overhang: 400 mm.
* Side eaves: approximately 200 mm.

## Roof Detail

I do not want conventional plumb-cut rafter tails.

* Rafters should terminate with a 90-degree square cut to the rafter length.
* End faces remain perpendicular to the sloping roof plane.
* Applies at both front and rear roof edges.
* Do not use a conventional vertical fascia simply to hide this geometry.
* Flashing and edge detailing should respect the roof slope.

The 1 m front overhang is intentional and must be properly incorporated into the roof framing.

## External Materials

* Walls: reclaimed weathered silver/galvanised corrugated roofing iron.
* Roof: reclaimed weathered silver/galvanised corrugated roofing iron.
* Existing patina and sheet variation are intentional.
* New flashings, corners, cappings and trims: fresh silver galvanised or Zincalume-type metal.
* No painted Colorbond-style external finish.
* Appropriate membranes, wrap, cavities/battens, flashing and condensation control required.

## Windows and Doors

I already have second-hand Monument-coloured aluminium framed double-glazed sliding doors and windows.

* Internal reveals: white-painted timber.
* Exact dimensions will be confirmed before construction.
* Final framed openings to suit the actual supplied units.

### Front / High Wall

* One large double-width aluminium sliding entry door.
* One approximately 1,500 mm wide x 2,000 mm high window, offset beside the door.
* Front elevation should remain open and glazed while retaining adequate bracing.

### End Walls

Each 3 m end wall:

* One approximately 1,500 mm x 1,500 mm double-glazed window, centrally positioned.

### Rear / Low Wall

Two high-level horizontal windows, each approximately 2,000 mm wide x 500 mm high.

* One above a future workbench/counter, positioned for an outward view while standing at the bench.
* One above a future king-sized bed against the rear wall, on the right-hand side when looking at the cabin from the front.
* Prefer a common head height if practical.
* Exact sill heights and positions to suit these uses.

All openings require suitable lintels, trimmers, framing, head/jamb/sill flashing and weatherproofing for corrugated metal cladding.

## Relocatable Sled / Floor Structure

The cabin will initially sit on ground screws but may later be lifted and relocated. The floor is therefore to be designed as a substantial sled/skid-style chassis rather than a conventional fixed floor.

Proposed bearer arrangement:

* 3 longitudinal bearer lines running along the 6 m length.
* Each bearer formed from 2 x 245 mm x 50 mm timber members side-by-side.
* Total: 6 x 245 x 50 members forming 3 doubled bearers.
* Bearers extend approximately 300 mm beyond the building at each end.
* Overall bearer length approximately 6,600 mm.
* Extended ends intended as useful lifting points and to allow possible rolling or controlled relocation.

Relocation should be considered throughout the chassis design. Final lifting/relocation engineering may be separately verified.

## Ground Screws

* Cabin initially supported on ground screws.
* Layout to suit bearer spans and structure.
* Connections must provide positive tie-down and lateral restraint during normal use.
* Connections must allow later disconnection for relocation.

Final ground-screw capacity and engineering may be separately verified.

## Bearer Blocking / Anti-Roll Restraint

I specifically want substantial restraint between the three bearer lines. The doubled bearers must not rely only on floor joists to prevent rolling or twisting.

Provide suitable:

* solid blocking;
* cross-members;
* cross-bracing and/or straps;
* end blocking; and
* positive mechanical restraint.

The floor/sled assembly should behave as one rigid chassis when lifted or moved, resisting bearer roll, twisting, racking and relative movement.

## Floor Joists and Insulated Floor Cassette

* 190 mm x 45 mm timber floor joists.
* Span approximately 3 m.
* Approximately 450 mm centres.
* Blocking/noggins as required.

Floor build-up:

* Australian hardwood floating floor.
* Structural Yellow Tongue particleboard or suitable equivalent.
* 190 x 45 joists with wool insulation batts between.
* Underside fully enclosed with exterior-grade/structural plywood.

The underside plywood is to protect insulation from wind, weather, vermin and debris, prevent sagging during relocation, and contribute to a strong enclosed floor cassette where appropriate.

Drafter to recommend plywood thickness, fixing, sealing and moisture-management details so water cannot become trapped within the cassette.

## Wall Construction and Insulation

* Conventional timber stud framing.
* Drafter to determine/document stud sizes and centres, plates, lintels, trimmers, noggins, bracing, tie-down and connections.
* External walls insulated with wool batts.
* Wall build-up to address thermal bridging, condensation, vapour control, weatherproofing and cavity/batten requirements behind corrugated metal.

The large front openings require proper bracing consideration. If portal framing or engineering is required, identify it clearly.

## Internal Walls

* 12 mm marine plywood as finished wall lining.
* Painted a slightly warm off-white.
* No plasterboard.
* Simple, deliberate joints and trims.
* White-painted timber window and door reveals.

## Ceiling / Roof Insulation

* Ceiling follows the 15-degree roof plane.
* Internal ceiling lining: 12 mm marine plywood.
* Ceiling plywood clear sealed, not painted.
* Roof/ceiling insulated with wool batts.
* Roof build-up to provide good thermal performance, suitable membrane/blanket, condensation control and ventilation where required.
* A roof/ceiling cassette approach may be used if appropriate.
* No flat ceiling.

The thermal envelope should be continuous through floor, walls and roof/ceiling.

## Services

No electrical, plumbing, drainage, gas, HVAC, communications or other services design is required.

Scope is structure, envelope, insulation, openings, cladding and construction detailing.

## Required Drawings

At minimum:

* Cover sheet / drawing index.
* General construction notes.
* Dimensioned floor plan.
* Bearer/skid layout.
* Ground-screw layout.
* Floor joist plan.
* Bearer blocking / anti-roll detail.
* Floor cassette and underside plywood details.
* Ground-screw-to-bearer connection concept.
* Extended bearer-end details.
* Wall framing information.
* Stud sizes and centres.
* Bracing arrangement.
* Lintel/header and large-opening framing.
* Wall build-up and corrugated cladding details.
* Roof framing plan.
* Rafter sizes and centres.
* Front, rear and side roof overhang details.
* Square-cut rafter-tail detail.
* Roof build-up and insulation/ventilation detail.
* Four elevations.
* Minimum two useful building sections.
* Window and door schedules.
* Window/door flashing details.
* Key junction, tie-down and fixing details.

## SketchUp Requirement

Preferred workflow: SketchUp Pro + SketchUp LayOut.

Required deliverables:

* Editable .skp model.
* Editable .layout file.
* Complete PDF construction drawing set.
* DWG/DXF exports where practical.

The model should use sensible groups/components, tags, scenes and naming so I can inspect and modify it later.

## Australian Experience / Standards

You must have demonstrated experience preparing Australian residential or small-building timber-frame construction drawings.

Drawings should reference:

* NCC requirements applicable in Victoria.
* Relevant Australian Standards, including AS 1684 where applicable.

Identify items requiring separate engineering rather than treating drafting as structural certification. Likely examples include:

* relocation/lifting loads;
* final sled/bearer design;
* ground-screw capacity;
* unusual connections;
* large glazed openings; and
* 1 m front roof cantilever.

The objective is a construction-ready and engineer-ready drawing package.

## When Responding

Please provide:

* examples of Australian construction drawings you personally prepared;
* confirmation you work in SketchUp Pro and LayOut;
* confirmation editable source files will be supplied;
* your Australian timber-framing experience;
* fixed price;
* expected turnaround; and
* any immediate concerns or suggested changes.

Generic architectural rendering portfolios are not what I am looking for. I need someone who understands how Australian timber buildings are actually constructed and can document this design properly.