I might want to do the same thing. If I recall, I think Bob Austin made a board that slipped into the dive ladder mounts and was able to mount the kicker to that. Depending on how the Tomcat trolls on a single engine, I might want a kicker mounted in the center of the bracket (probably needs to be a long shaft kicker for that). Also, it would be nice if it could be steered via a remote control. I might consider looking at a solution using a generator and a bass boat like electric motor for trolling.
After I posted this - I did some looking around in Bob's photo album - here's a
link to the pages showing some pictures of his kicker mounting plate.