Thats why i had that slot cut out. starts right where your arrow is and extends to same position on other side. gives you full access to the panel. I have a few stress cracks that i think were caused by the rotten wood. I can picture twisting occurring by not having a solid piece of wood in both the inner and outer transom areas....
I think I follow what you did with the slot in the slashwell, but the piece of plywood extends past your slot and goes under (what I'm calling) the SST side plates. Those big main plates are notched over the ply, which mean you cant get it out/in as a single piece, correct? The best you could do would be a single piece as long as your slot but that still leaves the outermost portions on both sides of the IB transom as separate pieces. So you would still need to replace with 3 pieces.
I think about how the forces are transferred from the motor to the hull and can not see how that piece of ply is a part of the force transferring system. There is little structural capacity in that piece of wood.
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