All n' all - pretty nice! Saw the ER photos posts ago. Clean up and product survey needed there.
Sure looks like it was built out from a "Marine Management" hull mold. That was a Florida east coast outfit that, during the 1970s and 1980s, sold many rugged commercial boats, often delivering them for another yard or end-user to finish as they preferred. If that's what this is, the hull will outlast most of us on this forum.
Did they build their hulls on the Miami River? I remember a company building hulls like that near my store during the time you mentioned.”0