If I was in the market for a new 7 I wouldn't buy one. Why? Because it would be more economic to buy this one & use it as a base for a more powerful car with all the toys. I reckon it would cost less than £15,000 to strip, refurb the chassis with new powdercoat, panels, fibreglass/carbon etc. The engine isn't upgradable but with a later VVC engine it would make a fine base for a 200BHP plus car.
The only downside is that it is factory built, which lumbers it with a working catalyst for MOT time, however pre SVA reg amateur built cars must have a premium.
This of course assumes the buyer wants a big project.