Hi Michele,
Well, here's my reaction. This car sounds like a big load of trouble. As I say this is just my opinion.
1) OS Giken twin plate may be tough to drive. My OS Giken twin plate sounds like hell and is unforgiving.
2) APEXi powerFC $1,450.00 AH HA HA HA HA. Or $900 through a group-buy and 5 mins to install.
3) 19" x 10" wheels and tyres $3,600.00 - they're going to feel like hell. bear in mind that the gtr originally came out with 16"! also, getting it registered may be a mission - that tyre placard won't be very convincing. also all four must be the same size or attesa will choke.
4) all that stuff will be tough to register. it'll have to be engineered.
5) all that stuff will be tough to insure. very tough.
Finally, if the dealer is rude in any way, I think you should walk away. They don't even have your money, and they're being jackasses?? HA! Doing business involves good relationships in both directions.
If you do decide to go with it I echo CEF11E's advice to get Nathan to check it out. He's a really nice guy and does great work.
Like I said, just my opinion.