Hello, basically you can make your own car but only realistic logical things and if I found it not realistic or something wrong, I will not approve it because of either lack of safety or something not right, anyway here list -Length, height, width -engine, clutch, gearbox, differential -rims, tires, wheel, suspension, ground clearance -safety -price -vehicle body type -extra details This only for people who has good car knowledge and I will be very honest to approve or not approve