hi dude if the car is all matching numbers and a one owner the bloke should still have all books and receipts,,, witch will make it a good starting point,,, as to the damage of the car you say good skirts and front rails??? thats another good start as you can build the rest of the car around these panels,, if it was me i would low blow him with a offer of 10k but i would be ready to hand over 30k,,, by the time you spend another 35k getting it all sorted, it would still be a good new al matching numbers car with books that owes you 65k top end
good luck and check before the cheque
cheers gong