As far as your issue I would reccomend that you just try harder. Nobody is going to create a custom mesh for you for 600L$. Also the legality of that is probably questionable. If your trying to get someone to upload YOUR dae. file for you, I will just say that its not going to matter whom uploads the file because its probably the original mesh . If you are unable to upload because you dont know how to do it correctly then I would say you need to start with a smaller build and work your way up.
Maddox