Just some thoughts and observations on registering / titling since I had to jump through the hurdles no so long ago.
1. The DMV here in Mass. said you had to have the vehicle completed before they'd even look at it for a number, whether original or assigned.

2. The new regs wont allow you a "home made frame". it must have a certification! And who gets certifications? The OEM's!

3. Drivetrain is in the same catagory, the emissions, exhaust, fuel systems all need the certification number, even the rear axle must be within 10% of original!

My car was one of the last to get through the "old" rules. I don't have to meet emissions and can have any engine / drivetrain combo, etc. Even cars built out of state and have a title are starting to be questioned about meeting the new rules. So the old days are gone at least here in Mass.! Heck, even the state Model "A" club members are screaming that they cannot register / title their restored cars! And these guys might be in their 70's and have owned the same car for 30 / 40 years.. They might've just had it off the road for a restore say 9 or 10 years ago, now they want to re-register it only to find they can't! It won't meet the new regs!

I think the suggestion to verify the process of registration / titles should be performed so you are aware of all that is required going into this.