I used AVA in the past. You have to admit, the fabrication work is excellent. Timescales on the other hand, could probably use a bit of work....
But all these cars that have exploded and taken 50000 years to complete, are always a bit different, a bit special... Not your usual run of the mill. A 1988 535i with over 400bhp at the wheels is not a quick 2 week in and out job. There will be issues as you find the weak areas of the engine. However, 5 years is taking the piss. But for all we know it took him that long to pay up! We don't know the whole story, and likely never will. Speculation isn't a good thing, and damages peoples livelyhoods.
My advice to everyone, is to buy an Evo. Everything is simpler with an Evo.