Compact Motorized Telescope Mount Design

I need a mechanical engineer to develop a concept for a compact motorized ALT/AZ polar-alignment platform, supported by preliminary calculations, component selection and packaging checks. This work will become the basis for subsequent detailed engineering and implementation.
The main priorities are mechanical simplicity, low total cost, easy manufacturing and straightforward assembly.
Reference and requirements
- Avalon Instruments UPAS is the reference for overall size and form factor: approximately 179 × 179 × 158 mm. Please account for the complete moving envelope, motors, manual knobs and cable clearance.
- The platform sits between a tripod and an equatorial telescope mount, providing fine ALT/AZ adjustment for polar alignment.
- Target supported mass: 25–30 kg total, including mount, telescope, accessories and any counterweights.
- Approximately ±5° adjustment on both axes.
- Motorized operation and manual knob adjustment when powered off, without releasing locks, disengaging clutches or operating selectors.
- ALT motor attached to the moving top plate and contained within its footprint.
- AZ motor positioned above the rotating plate supporting ALT.
- Initial mounting interfaces: original ZWO AM5, Sky-Watcher Star Adventurer GTi and ZWO TC40 tripod, using interchangeable adapters.
UPAS reference:
https://www.avalon-instruments.it/product/universal-polar-alignment-system/
Preliminary FreeCAD models are available. You do not need to preserve the existing mechanism: simpler alternatives are welcome. The internal UPAS mechanism has not been verified; the reference establishes the intended functionality and compactness.
Required deliverables
1. Complete ALT/AZ concept
Explain the mechanisms, fixed and moving parts, load paths, motor drives, manual operation and position retention when powered off.
2. Dimensioned 3D concept assembly
Establish the main geometry, travel, motor positions and interfaces. Check clearances throughout combined ALT/AZ movement, including access for knobs, fasteners and assembly.
3. Preliminary engineering calculations
State load cases, centre-of-gravity assumptions and margins. Estimate forces, moments, motor torque, manual knob effort and relevant strength/stiffness requirements. Distinguish calculated results from assumptions requiring later verification.
4. Real component selection
Identify suitable motors, screws/nuts or gears, bearings, guides and other components using actual manufacturer references and specifications wherever possible.
5. Materials and manufacturing approach
Propose materials, preliminary thicknesses and main dimensions for custom parts. Explain how they can be manufactured economically through PCBWay and/or JLC CNC.
6. Preliminary BOM and cost estimate
Separate purchased components from custom parts, with quantities, supplier references and clearly stated cost assumptions. Prefer standard components, few machining setups and minimal special tolerances.
7. Engineering handover
Deliver editable source CAD, preferably FreeCAD, STEP files, calculation sheets and a short report identifying design decisions, unresolved issues and the checks needed during detailed engineering.
Scope boundary
This phase does not require a complete production drawing package, comprehensive FEA, electronics, firmware or a physical prototype.
However, it must provide more than a visual model: the mechanism must be sufficiently defined and calculated for another person to continue detailed engineering without having to redesign it from scratch.

Please provide your timeframe, relevant mechanical-design examples and proposed CAD format. Clearly identify any exclusions.

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