I think I may have a solution to my problem.
1. Take it to MVD for a level 1 inspection which can assign a VIN.
2. A bonded title can then be issued.
3. Purchase the bond.
4. Build to satisfy street legal and safety requirements.
5. Take in for level 2 inspection and registration.
This from the Arizona DOT, I hope it can help someone else in similar circumstances. Thanks to
https://www.buggiesgonewild.com/member.php?u=96079 (Reddawg54) for pointing out that it may not have a VIN and may have never been titled.