I have a campaign up right now to get donations to buy a 3d scanner I am going to scan in bare chassis and compile a database of free downloadable CAD files. People can then go and download the chassis that they have and open it as a solid model to design parts off of. It is a big number but if everyone gives what they can then there will be a database that could cut down fabrication time and guessing how far the trans tunnel hole is what is the location of the subframe studs, etc
http://www.qikfunder.com/crowdfund/3d-chassis-scan