Welcome Mike. Quite a few here have fallen into the scratch built insanity. I'm 15+ years in myself. Drivable but not street legal yet.
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Two major learnings.
1: understand up front what it will take in your state to get a tag/title. Some states are easy, some are hard. Some damn near impossible. Alabama is hard. In retrospect, I should have bought a used Corvette and rebooted and repowered it.
2: build some typi of 'hard buck' to ensure your sheetmetal is symmetrical.
Full fendered and roofs, doors, and windows increase complexity a LOT