assuming you'd be gutting it and not restoring it, i'd probably do 50. it been wet...for a while.
the legs look rusty, and it's going to cost at least 100 bucks to get it to 150 sale condition. (glass, paint, and your time and effort)
pass @ 150 unless you can get both for 150, then go look at it IRL and think about it. if the guts aren't what you are after, tell him to keep the boards and sell the on ebay or something. give you a deal. get them out of his hair.
i've personally chopped up nicer looking full size cabs and chucked them in the dumpster. if someone offered me 20 bucks for it i'd have loaded it in their truck for them just so i din't have to spend an hour chopping it down.