[EDIT: Mea Culpa - he did modify the rear wheels only in the prototype] Actually, I think it is perfectly practical for a DIYer like me, with the following sma

[EDIT: Mea Culpa - he did modify the rear wheels only in the prototype] Actually, I think it is perfectly practical for a DIYer like me, with the following small caveats (as opposed to your large caveats): 1. Use a front-wheel-drive car as the donor. 2. Mount two motors on the rear wheels (one per wheel). This way: 1. The first instability from torque steer due to driving only a single wheel is gone - car will accelerate in a straight line because equal power is provided to both wheels. The second instability from larger unsprung mass is easier to mitigate on non-steering wheels (i.e. the rear wheels). The third instability from increased wheel offset relative to the kingpin is completely removed. 2. Modifying the offsets on the rear axles (specifically, reducing them) in a FWD car is simpler[1] than doing the same on the drive wheels. If a double-wishbone design is used, it becomes a little complicated, but no more complicated than doing the same on the front. 3. The rear wheels do (IIRC) ~10% of the braking work that the front wheels do, so there is less heat generated. Until recently, quite a lot of the low end cars came with drum brakes on the rear anyway/ I'm curious why he placed the prototype on the front wheels - he must have had a good reason. After al;, someone who came up with the design itself isn't stupid, and someone who actually modded the car knew what they were doing as well, so there's probably a good reason for modifying the front wheels and not the rear. [1] Still complicated, but a lot simpler - because the wheels don't steer there is no need to worry about the steering geometry, track rods/steering rack modifications, etc.