has this been done before?

is it possible to convert a right hand drive R34 Vspec 2 to left hand drive or any other skyline for that matter? If so how much would it cost.

yes. i bet if you did a search, you'd find that it's been done.
it doesn't really matter, b/c you can't legally get one in the states.

You might want to check with Motorex. They’re the only ones who can bring Skylines into the US and make them street legal.

Here’s a link to some info you might like to read:

http://www.automotiveforums.com/vbulletin/showthread.php?t=109372