That certainly represents a lot of work, but some things (ok, a lot of things) don't make much sense.
1. Why use the E39 stock seats? They weigh a freaking ton! Just use some Corbs or Recaros. Unique? Yes, but also not a terribly good idea, methinks.
2. The AC system looks like something behind the dash exploded. Considering the rest of the interior, an enclosed vent set would have looked a lot more professional.
3. The blacked-out trim is a nice touch, but this is a car from the chrome era. It just doesn't look quite right. Heck, even the race cars sometimes have the chrome trim.
4. Call me crazy, but I like the slight lip from the front air dam. Said dam could use some more blending into the widebody arches, however. The rear spolier needs to go. Stick with the batmobile rear spoiler. The rear diffuser-looking thing also looks out of place, especially since the underbody isn't streamlined enough for a diffuser to have the desired effect.
5. The widebody looks, well, bad to me. I much more prefer the Gr 4 Clader flares, they look a bit more natural to the car.
6. All that bodywork, and it uses an essentially stock M30B34? Talk about show and no go. At least stick a S38 in there!
Still, it is a suprisingly complete package, and it obviously took a lot of time and effort. Just not my cup of tea. I like the quality of interior work, though.