Photos below of the bottom of the slim4, also a photo of the bj4 worlds chassis against the slim4, the bj is 123mm wide and the slim4 is 95mm wide.
One of the major advantages of a narrow chassis is when you are cornering and the chassis rolls the sides normal contact the ground, on the slim4 you don't get this problem so handling in the corners is improved as the suspension is not upset as the chassis sides bottom out.
Re selling it i aim to start selling just the shock brackets, then at a later date a conversion kit for the worlds car then the std bj4, and if people want it i will hand build complete cars, and no it will not be cheap. But i never setout to make a cheap car, the aim was to improve on what is out there, the test car has steel screws below the centerline of the diffs, above that they are all titianium or aluminium to lower the c of g as much as poss.
If there is demand a shell could be produced, i can get shells made no problem, its making the mould which is the tricky bit
