i think its funny that before importing cars was popular and I was importing engines (2001-2003) that I read up on all these laws years ago and was going to go the kit car route, it was just a damn shame that my supplier in new zealand thought that fucking me out of $23k was a better deal to him then making that back in just car sales over the course of 3-4 months.
Florida doesnt require any sort of inspection for kit cars. Basically you bring them a list of what motor, chassis, head/tail lights, etc you used in and a name for the car, an identification number and thats it, you get a title and your on your way. Then for insurance, you just get a speciality car insurance that insures comp & collision on kit cars and your set.
To get a car into the states is easy, just pull the motor out, its considered a non op parts car, ship the motor in a seperate pallet, drop it back in and go.
I even heard of people going as simple as pulling seats, wheels, and a steering wheel out, but thats boarderline since the car is still a turn key. Pull the motor out and its a sure thing
All you really have to do is put strut bars on a JDM car and just call it your own modified chassis baised off a nissan chassis, its all pretty simple.