Had one myself when of similar age in mid sixties (now 65). Model was by Keil Kraft of Canvey island, Essex. Completed mine in 1965, fitting a Frog Marine 3.5cc engine and boy did it go! Sailed it mostly on the boating lake at Southchurch Park, Southend, Essex, and also once in the sea at Oostvorne in Holland, where I nearly lost it. I passed it onto my nephews in the 70's, not sure if they still have it, but if they do, I will pin photos. Meanwhile, have pinned photo of real thing.😎

Well you certainly don’t want to rush it ha ha