Very much in the style of a boat I built as a 15year old apprentice back in thevearly 60's, I got the plans from an American magazine. However looking at the straight in the sheerline (plan view) running aft from the stem, I would guess it may be amateur built
I had a very similar one. I actually bought it for the very nice vintage 15 or 18hp Johnson that it came with.
It may have had a front and rear cockpit rather than a larger one like yours
Mine was built by Dobsons of Shardlow, a boatyard that is still going.
It had a pressure sensed speedo going up to 60mph IIRC!