It is possible I have the same model in my basement. The date is right, mine is about 36" long (too lazy right now to go down and dig out the model and tape measure).
I bought it for a couple of bucks around 1967, assembled, from a friend who didn't want it and over the years it has become a sort of test bed for me. It is also on my list of projects for a restoration.
Mine is balsa with mahoghany decks and cabin, I have no idea who made it. It originally had no RC but I added that and tried various motors and other gadgets over the years.
Does this sound like yours? If so maybe I can help with details, but sorry but I have no plans for the boat.
Good luck,
Bruce