Blue Prints
I'll bet Hatteras could come up with copies of the electrical prints for you. They used to be called blue-lines and require a special copier for blue prints from the 50's-70's vintage, when blue prints were actually "drawn" with a pencil, or in some cases, special ink pens. They were drawn out on special mylar film or on standard size white print paper. Since the originals films/papers were transparent, when run over a special copier machine, a copy came out on either brown or blue paper, ergo "blue prints".
I have all the gravings (blue prints) thanks to the previous owner who purchased them from Hatteras.
Sam's Marine owner Steve McPherson might have some insight, as well. Drop him an email- might not get back immediately, so might need to call him.
Good luck,
50 years on Great Lakes