There are discussions on here about two Rob's "robbing" people, one of them being the one you talked to. Apparently just because you fly out to their home, eat dinner with their family, it doesn't mean they won't take your money and judging by other's experiences, you can't do much about it. The car doesn't look much like a lambo anyway. The safe way is to build it yourself, we're a little lower on resources in the replica industry when comparing to the kit car industry. If you don't have time to research, it's probably a bad idea to jump in to this being unsure. These forums will be your ONLY source of info, you can't just search google and find a real builder, sadly. It sucks to see people get scammed, even when they were warned.
I assume you meant you wanted a murcielago?
For your purpose I'd say go with a diablo or countach, at least it will look more like the car it's resembling. I think the murcielago requires more work, attention to detail especially if your budget is low and there are too many really inaccurate bodies out there for it.
I'd be just as impressed to see a diablo in your shop..