I paid 1K for an excellent running car that only needed some minor restorations.. I paid much, much more for the missing equipment. That's the deal of the century but Ed is right, I would not pay 5K for a project that need that job on it, except if the car have a local history or this kind is specifically needed.. or if Im rich enough to have it made by someone else..!
At least the seller add some interior shots this time. The trade is a good idea but it depends which shape he considers a mustang should be to worth the ambulance..?