I'm busting major nut over here... Loving the idea and build so far.
What's the rough cost of one of those kits? I imagine the frame is already done, and you just put the body/drivetrain/susension/interior in? Their US based site is a little light on details.
This is something I'd definitely sell my S13 for as a balls out track car.
And good move ditching the EJ20!