Hi there,
This is Bogdan from Romania.
I'm a mechanical engineer - specialized in the industrial robotic field, 3D designer, industrial designer and, 3D modeler.
For some of my projects, I'm also doing the physical prototype too.
I'm doing product design, industrial design, reverse engineering, ideation, etc.
I have over 15 years of experience working on various systems/devices across multiple industries, from concept to launch.
1 - in the first place I will need to see the existing model and the level of details used for the parts and assembly
2 - as you described and requested to make all the parts fit together, it might need to actually redesign some parts from scratch and align it/them with the rest of the components
3 - as you want to make the prototype by cnc, you will need DFP (design for prototyping) set of models/drawings which require a pretty fair level of accuracy and tolerancing :)
4 - we'll have to discuss about the materials used for prototyping and colors/textures
For any more questions, we could chat here, including the whole details of the project, final price, time frame, deliverables, etc, etc...
Regards
Bogdan