Stink, you one of the craftiest guys on the board...good stuff and the risers on the bottom, GOOD touch ;) ... when we mounted my buddy's TM, he wanted the motor-head inside the rub-rail and not inside either, so it stores right over the gunwale...in order to get it right there, we cut a piece of 1" S'board to match release bracket, plus a "dog-ear" for some more mounting surface ... thought there might be some "idea-starters" here for ya ;) ...
...although I'm SURE ya got plenty ideas on your own 8) ...