This hull has an early 80's look to it (I'd guess '86 by the rake of the windshield) and would fall well within the HIN (Hull Identification Number) requirements that came to be in '73 (I think, maybe '74) The USCG has a list of the manufacture codes (first 3 digits of the HIN) and pulling this up on their web site will yield the manufacture. With some luck it will still be building boats and a call or stop at their web site will get you something.
The folks that issue registrations may be able to help as would the title. The HIN should be on the title maybe the manufacture, model and certainly the year built. How about the pervious owner, possibility a title search at the hall of records.
What does the glove box button have stamped on it? How about the fuse panel? There are many locations a manufacture would make a little part and have placed their logo on it somewhere. The steering wheel is usually the engine control manufacture as is the control head (the shifter) and probably says QuickSilver.