Well, I just recently got hit from behind by a member of this board.
I needed a new bumper ($1400), rear panel ($450) and Rear Bar Reo($450).
The parts alone there are worth over $2.2k.
The rear quarters need to then be sprayed and because the roof and rear quarters are one panel in skylines, the whole roof needs to be sprayed.
Add to that the rubbers around both front and rear windows as they have to come out, plus badges, seals, bit and bobs and the bill for the little shunt came to just over $7k
Remember this is a Nissan.
BMW parts would be much more expensive for a start.
Unfortunately I think in this case you are going to have to fess up with the cash.
Sad but true.