When Aerokits started selling their initial range, "Scale" didn't seem to factor it was mainley "To suit" - whatever size Diesel engine (Proper power units).
At a glance, the Hornet seems to have been loosely based on one of the Cris Craft designs and as the closest looking ones of the fifties were about 20 to 25Ft in length, your scale would be about 1/12th or 1" to 1Ft.
Regards Ian.