£7k is cheap - only about £1500 off its value as a breaker! You could probably sort most of that for about £1200 (excluding chains), but £2k probably not far off by the time you allow for a service and a couple of unknowns:
the cambelt was last done 30,000 /6 years ago: £400.
it has a intermitant CEL warning, throttle body not yet refurbed: £400 refurb.
fault on suspension: £150 used actuator (assuming one only).
cam chains not done: Most likely ok.
worn interior: Depends what it needed, but some Liquid Leather recoloniser for circa £20 would probably clean it up a treat....did this on my old Audi.
bubbled up leather on drivers airbag: £5 glue and half an hour of patience!
aircon dont work: Hmm, not sure. Depends on fault. Not working at all, or not blowing cold? Perhaps a new compressor, but possibly just a regas at £60 or so.