we need to unify/curate the collection of cars. i propose to use the types of car found at secondhand sales. this is a big generalisation but i think it would be mainly cars from the 80,s and early 90's. economy cars. bargains buys like the objects they transport. it also helps that usualy these shapes are slighlty more angular and hopefully easier to make
eg
ford escort mk2
vw golf mk1
rover 216
renault 5
peugot 205
and the Japananese models like
nissan bluebird
toyata carina
As Gaby suggested it is not about the car design but the uniform presentation. So extroardinary models that don't fit within a carbootsale profile don't work.(henny)