The only part I can answer is that you won't be able to bring it (import it) to the US. You may be able to drive it in for a period of time if it is registered in Mexico, but you'll never get it registered in the US. Two reasons - safety standards for US vehicles and emissions standards. Sure, you could spend a boatload of money on it to modify it, but by then? Not even worth it. The same holds true for many Mercedes and other vehicles built outside the US. You have to buy one that was built for the US market or you'll never be able to legally import it. Kind of sucks, but that's the way it works.
That said, before they ended "Beetle" production in Mexico, there was an outfit in Nogales that would build a brand new Beetle for you. The catch was -- you had to bring them a wrecked or scrapped Beetle that was originally titled in the US. They used the pan and those original VIN numbers to build you a brand new one. They could skirt the import law because the Beetle had originally been sold in the US market, so it was a rebuild, not a new vehicle. I'm sure they, like the Beetles, are long since gone.