CAD files of conversion parts....dont think there would be to many people out there doing FEA on the parts they are making for their own private conversions, usually you just a case of building something that joins the gaps, making a dummy part or 2 to figure out what will work

maddat crossmembers arent overly expensive....but to put it in perspective i think my crossmember would have cost me about $10 plus a half days work