I've had to pay for parts in full when ordering at other places and I think it's only fair they ask for a $500 deposit. If your not happy with that just go back when they have more stock as they always have shipments coming in
A tow truck driver once jump started my car with the polarity back to front and I had a similar situation and lucky it only blew my 2 main fuses. I'd start with checking them
From memory but correct me if I'm wrong the nismo 32 gtr didn't have ABS for weight reduction. That's an easy way to tell if it's a nismo edition. Good luck with the sale of an awesome looking GTR