Im sorry but why are you lot ripping the *** out of him for buying a new merc to modify. To me it doesn't seem too wrong, you have lots of money and want to have an original upmarket car. I would do the same thing. And I would choose a merc over a BM as well, they are still seen as more upmarket than BM and there are fewer on the road. To me some of the comments smack of jealosy that you can't afford that type of car and have to make do with modifying some clapped out 15yr old car (not saying all of your cars are like that).
What i'm saying is give him a bit of slack on the project part of the car, its not that far fetched.
On the other hand even though I would like to believe him the pictures do seem a little suspect, most of them looking like they were taken from the main dealers website (showing small bits like seat and steering wheel)