I live in new york. I am very much interested in purchasing a fully built kitcar.
A good knowledgable friend of mine told me the steps of how to do it...
(1) Source a LHD 406 form Europe or ask Extreme if they can for you.
(2) Pay them to build the kit on the car and finish it off
(3) have them ship the car to you WITHOUT the drivetrain (engine+trans+etc)
(4) Customs *should* allow it, as you would declare it as a custom body shell
(5) Transplant the NYC smog certifiable engine and transmission you bought into the Extreme body.
(6) In NYC register the car as a "custom built" car (which it is because the frame is customized as is the body panels as is the interior, etc.)
(7) If any problems arise with this plan please place all blame on Argus X575.