no they wouldnt because a skyline is released in the US. legalization process has to happen if the car either 1.) isnt available in the US or 2.) there is the same model available in the US, but there are no similarities.
if theres a model available in the US, they have to be very similar to the import model. if there arent enough similarities, you need to have it legalized to meet EPA and DOT standards. you would be better off buying a civic and (unless you already have one) converting it to rhd. ive seen it done to US cars many a times.