I came across some drawings (c mid 1950s) from a commercial boatbuilder, does anyone know if it was ever built or commercially available? The engine arrangement is quite different from the marinised car engines previously used on other models. The boat itself would be 14'6" with a beam of around 5'6".

It has shades of Archangeli / Donoratico and the drive looks very much like an early Volvo Penta 100 series, so possibly early 1960s instead.

I agree with Rapier on the engine - The exhaust set up is a givaway, an early Volvo Penta - probably a B16 (1600cc) and a 100 drive - VP intooduced their first sterndrive (ahead of Mercruiser) at the 1959 NewYork boat show, so possibly she is an early 60's design