slightly stupid idea but would it be possible to create a simple car from scratch from the garage. Now what i mean by simple is no moving parts (ie doors or tailgates ect), no lights and no vinyl's but using prebuilt frame parts (ie 40cm long chassie beam) to create a frame like lego, stick 4 wheels on the vehicle and the axle and using a system like blenber and a system seen in games such as battlebots (i think) create custom shapes such as ramps,blocks and panels of very basic standard with all the physics already applied. In simple terms a system similar to lego digital designer for the garage which allows beginners to create simple vehicles even if it doesn't deform.