Hi there,
The car is mine, I bought it like this some time back. The original body parts are not with the car anymore and in my opinion that would be a very expensive job to get done. You could take a look at sites like lambostuff they might have something available but it is going to cost you an arm and a leg, not even mentioning the shipping.
Maybe the previous owner has an idea where the original parts went(I can give you his number) or the guy who sprayed the car(Ah Long, from the Lamborghini damage repair, upstairs Eurosports)
There is 1 more diablo in Singapore and that is an SV so you most likely have to import parts if you want to restore it to original. It is a 20 year old car and 1 of 2 in Singapore.
As for servicing the car that's has been done by Eurosports (Lambo dealer) so that shouldn't be much of an issue.
As for the mechanicals, no issues except for the battery that drains( need to keep it on a trickle charger),my suspison is that it is for the most part the alarm system.
New clutch, new cooling hoses etc. All receipts from Eurosports available. Keep in mind that if you have to sent it there it is not going to be cheap.
I sent you an pm, so just give me a call
Rey