Ok, so I talked to my buddy, he did have a 1996 GTR33 that was brought into the country in pieces and reassembled as a kit car, this is what the place was doing, and making titles for them legally. Once the car was stripped, the frame was cut in half, and then they were shipped as parts. Once in America the frame were welded back together, and the car was reassembled, and a company titled it (how I am not sure). Eventually the DOT and US Customs came and shut it down. Some people kept theirs, since they were legally titled, my buddy tried to pull a fast one with VIN's, and didn't get away with it. There are a lot of people in this country driving around in legally titled RHD Japanese cars, but a lot of them are in a grey area, some are fully legit.
One thing you could look into is a salvage titled kit car, that is if you can get the car back to the US. I think importing the frame whole is going to pose a problem, and I am not sure that the military will even let you do that.