2-3 years back, a Missouri builder had problems with registering his car. He needed a copy of the title, or something like that, to prove the engine was legal. He ended up having to sell his build. Jack McCornack looked into buying it at the time but could not get it registered in Oregon without the VIN or Title or copy or something....... Do a search on author MartyNygard in the for sale section.
Keep
everything as long as you can is the best practice. Parts, paperwork, everything!(if you can).
In Ilinois, 3 to 4 years ago, I got away with a copy of the title and a bill of sale from the guy who sold me parts. The title was not in his name and the VIN number was not on the engine. The stamped engine markings were difficult to read at best, One or two digits could have been a 3, a 6, or a 9. Mazda North America could not verify the engine number since the vehicle had a salvage title. I think I got lucky. I'm not complaining.
Every state's process is different. Best to only use Missouri builders as a reference, and recent ones at that. PRocedures change, even within any given state.
BTW exactly what part of a Miata is "the frame"?
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Chuck.
“Any suspension will work if you don’t let it.” - Colin Chapman
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