swap body, axles, vin, etc... ??

[cochino12]

Here is the situation. There are two seventy three trucks, the 1/2 ton with has an excellent body/paint job , no motor and no TITLE. The other 73 is a complete rust bucket but has title and 3/4 axles which I want.

I've never had to deal with a missing title before but I know it's a major pain. The owner says he can get the title but it will take a few weeks. Any ideas what I should do here?

I was thinking of just swapping axles and borrowing the vin from the rusted truck but I really dont want to get in trouble. Has anybody done this?