If your dad still has the original paperwork that came with this boat, there should be some fairly well detailed drawings of the the boat. My old sailboat (circa 1973) has had multiple owners in the past but all the brochures, sail diagrams, maintenance records, receipts, etc., have been passed down from owner to owner. I could, if I actually had that talent, use them to scratchbuild a very detailed model of my boat. Ask your old man what he's got in the way of sales brochures that may have survived.