In the course of beveling the bottom edge of the transom, I took a couple of chunks out of the endgrain of the starboard side frame. Then, I head a ***CRACK*** on one pass of the plane. I ripped a sizeable piece of the side frame away from itself. I carefully chiselled off the exposed end, and on another pass from the plane... ***CRACK*** and I took another strip, this one very deep. I can epoxy this all together, but Id just as rather not have the integrity of the wood comprised. I only had one remaining bevel left with an endgrain, and I beveled it with a rasp and then planed the rest to match. Dammit-- This is an amateur mistake! Other amateurs beware!
Take note that I did not break the epoxy bond between the side frame and the transom ply, the surface layer of the side arm remains firmly glued to the ply.
