I have a few pictures of my 1931 on this lap top. Don’t know if they will be of much help to you. Only picture I have of the magneto is with the OMC style coil substitution. I won’t be home till mid-August to give you better shots. Just so you know when searching for parts the tiller mount is somewhat different on the 1930’s motors compared to the later motors.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.