David W. Braun prepared a drawing of Uintah combine 50 following its rebuilding. That appears on P. 172 of Bender's
Gilsonite Route. I'm not sure where the drawing may be obtained commercially, nor do I have information about contacting the draftsman or other copyright holders for permission to duplicate or use the drawing for commercial purposes.
Good luck with your project. This is an interesting car, and now that its restoration is nearly complete, it might be a good time to have a model available.
Cordially,
CVM
-30-