Wearable Skin Tension Device CAD Design

Hi! Here's a quick overview of the product so you can quote it:

WHAT IT IS
A small, wearable device that gently stretches skin over time.

HOW IT WORKS
- Two adhesive pads stick to the skin a short distance apart
- The pads are connected by a rail
- The user slides the pads apart to add tension
- A pawl (ratchet) locks the distance so the tension holds
- A simple release lets the user back it off or remove it

DESIGN GOALS
- Low profile and lightweight, so it can be worn under clothing
- Easy to adjust with one hand, in small, clicky increments
- Pads can follow the curve of the body
- No sharp edges against the skin
- Simple enough to 3D print for prototypes, and later to injection mould

WHAT I NEED FROM YOU
- A full 3D model in Fusion 360
- Native .f3d files plus STEP files
- Print-ready files for a first prototype
- A couple of clean renders

I'll send hand sketches once we've agreed on terms. I'd also ask you to sign a simple NDA and confirm that I own the design files.

What would you charge for this, and how soon could you start?