Trying to determine value of 1979 23' SF OB

[midnightmagic]

My friend has a 1979 Sea Craft 23' SF OB configuration. The red gelcoat is pretty much toast. Buff Master nor 400 grit wet sanding will revive...the red is very thin in most areas, nothing to work with. Anyway so the hull finish has to be redone. The deck is real soft on the port side...from stem to stern. This of course leads me to also worry about the transom the 2000 Yamaha 200 OX66 Saltwater Series II is hanging off of. I am connsidering buying the boat but NADA does not show Sea Craft. And of course i need to reconcile the boat's condition with the hull value. (I already have motor and trailer values) Can anyone help me with figuring out a value?