Not much tbh, one in that sort of state you may be better off just putting it on ebay etc and seeing what interest you get....it may be just what someone's looking for in which case they may pay good money for it
However, in my experience projects like that end up being such massive moneypits sourcing all the awkward bits and can end up costing much more than buying a half decent one in the first place.
What price have you in mind that you'd be happy to sell it on for?