Soft/Rot Wood on ply in bilge.
I have found some really good discussions regarding wood boats on the Chris Craft Antique Boat Club message board. Most enlightening are some of the replies by a Steve Smith whose company is on the web and there are about five urls attached to the replies, including an e-mail address. The product he endorses (and invented) is called CPES. I haven''t yet done any research but the product sounds like a panacea for all wood products exposed to the elements.Here are the addresses I have found:
Good luck, I have no real experience with woodworking on boats although I have one with some problem spots and I am resisting all temptations toward the hammer and saw!