Hey Daniel;
Having owned several 510's in the past (still have a very nice one i am rebuilding), and being obsessed with them since the 80's i can say i have seen dozens of great examples..
this one is the best by far though, clearly in a league of its own, and the poster of it from fast fours earlier this year is still on the wall above my desk at work and it gets a lot of attention from co-workers let me tell you...
awesome car, congrats to your brother and all involved and best of luck !!