Who Built This Boat?

US 45 is the boat in question. Richard Worsham in the Great Lakes area sent me these pictures with the hopes of finding out who built her. This boat has a deck step mast and once had an inboard motor. Richard is the third owner from his region, but that doesn't mean too much. The boat could have been in the Bay Area then shipped... weirder things have happened with these boats.
Does anyone recognize this boat? Bonus points to anyone with information about this boat's story.