No worries......if you own a cossie it will cost you money. Unfortunately they are all old and if not maintained be it bushes, misfires or a missing bit of trim there will be something needed.
If you go into ownership with this in mind it wont be such a downer, I'd been around them for years and knowing this I've enjoyed every moment of mine.
Interesting reg but the interior could be a bargaining point as it sounds abit max power era.
Id guess a good replacement interior will be around £1k??
Depends on what you want to do, i spent the 1st year returning mine back to standard and I'm glad i did as i like oe look.
Keep us updated.