Back in the 70s my father owned Leam, a wooden ex Thomas Clayton butty, converted and motorised. A Petter PH2W was installed in the back cabin, a stern tube fitted through the sternpost and the front part of ellum cut away below water level to accommodate the prop. And that was it. No anti-cavitation plates, and a thick wooden rudder right behind the prop. And while it worked, Leam was the slowest boat on the cut!
I probably have some general photos of the boat stored away, but none of the underwater detail as we never had the boat out of the water. (Under the water, yes, but that's another story).
After Dad sold her Leam was moored in Battlebridge Basin in London for a while in the 80s, but the new owner's planned restoration never happened, and she was broken up some years later, at Winkwell I believe.