Full engine with ecu and loom, gearbox, rear diff. At a rough guess up to £5-7k. More if you could go look at it first and be more certain of its mechanical condition
I bought an RS6 in worse condition than that about 10 years ago and made a fortune on stripping it and selling the parts.
If it was closer to me and not christmas I'd possibly be going to look at it...
It's likely (hopefully) never going back on the road, and not a cat d. I agree with a previous poster, possibly listed as cat d before the latest accident.
-t