Chair Idea - 3D model rework

Hello!
I have a 3D model of a rocking chair that needs to be properly redesigned and reworked.
I attached the .obj file bellow. The model is a started idea of how I envisioned the chair to look like. The main focus is the structure of the chair (should be made out of wood), as I would need it to be accurately redesigned - new parts for its structure can be added if considered needed, as I believe most of its core skeleton is not completed. The chair needs to be thought and designed to real-world measurements/dimensions, so perhaps it can be properly reworked in AutoCAD or any software that is accurate with measurements.
What I would need:
- someone that knows ergonomics and that is able to properly design its structure and be accurate to real-world;
- a proper 3D workflow of the object;
- accurate dimensions and measurements of the chair and of each of its individual parts.
Deliverables:
- the file of the chair (saved as .obj)
- a render/animation (up to you) of the chair and its parts that illustrates how it can be assembled;
- a render/image/illustration (up to you) of the ergonomics of the chair, and one with the measurements of the chair and its parts individually.

Thank you!