er.. is much more easy if everyone has the tool and knowledge to do the custom cars?
we can test the cars our self, test the images and etc.
why i need to send for yours my ideas and images for yours do the cars? if for some ranson i can't like the car what you've made for me?, or for give the custom design we must to enter in a queue on yours jobs for us? or queue to sell and buy system of the game in xbl/kai?
isn't much more easy way if every one who interesting having a tool or knowledge for do our self cars, made by we, with all changes, tests and etc.
i said it because when i creat a car, normaly i give up 4hours, if a decal or layer isn't in the position or size what i want, i normaly delete more other layers to test it or something like that, but when urs do the car for me, i can't observe and follow hows the car is finished, how the decal and vinyl will be on the car and etc.
that is the idea?
sorry for bad english.
this is just a constructive critic, for best.. for us

The problem being that it is a VERY complicated process and any tool would requre a great deal of knowledge to use. That aside, if everyone had access to this they would be editing thing on cars they shouldn't be changing... Physics/Ratings etc...