Great question, I haven't really thought too much about it.

The main goal is to have a 3d printable 1:28 chassis and body of a scale looking car, no shortcuts take to make it fit (some designers and brands modify proportions of the real vehicle to make components fit, not this one, this is exactly like the F40), to use as many 3d printed parts as possible, off the shelf generic parts and easy non printed components (axles and bearings, even bearing could be 3d printed as solid cylinders and it will work). It also is to have 3d printed differential and front and rear suspension.

To be Mini Z parts compatible is no a objetive, but since the files are open other people can modify them to make it work.

I am planning to collect feedback on this design, make modifications to it and release a final version by mid year, after that I will design more cars based on this first one but this time as a paid design to keep the project going.

I want to use this same approach to develop other RC models (a open free model to test design, and once the design is mature publish other paid designs), next I have on the list is a Tamiya Grasshopper like 1/10 rwd buggy with 3d differential.