Wow,big time memories
Those two holes you see in the eng well sidewall is where one side of the motor support was threw bolted,should be two on the opposite side
When we first got ours it too had a transom mount but was a pita to operate, so I built a new motor mount inside the well and dropped in a new 5hp merc., leaving the motor in while under sail was a difference of 1 knot speed loss ( 7.3knots with motor in well was the best we ever did) and not a big deal for us.
The other thing I did was, I added a hatch on either side of the eng well, port side aft was access to the portable fuel tank that sat on a platform, right behind the hatch was a std. deck fuel fill, and this is where I would run the fuel line from the tank up threw the deck fill then to the motor, when not in use, it was easy to store the line and screw the cap on, the other side accessed a cooler,for them occasional dead air zones
Damn that was a cool boat