Michael,
My pal and I have been restoring an early Rogers C26 (Hull number 14) and we have installed a Beta 13.5 hp. It didn't seem much bigger, if at all from the 10 hp and we liked the idea of a little extra power for motoring in extreme conditions.
The fitting wasn't too much of a problem but we had the luxury of installing the engine into an empty shell. At some stage in its life the boat had been holed and sunk. The plywood down below had mould all through it and the smell was terrible so we stripped her completely. We have rebuilt the woodwork around the engine and it looks pretty good. Totarom had never had an engine fitted previously as the owner was into racing so we also had to fit the sterngear.
Hopefully we will finish the last jobs this winter and enjoy next season afloat.
Tom
Totarom Rogers C26 Hull 14