major loss in stiffness by eliminating the boxes. The cracks at the bottom of the transom/deck and the one on the side show that the transom is flexing the rest of the boat. so the transom is not flexing, but it is transferring forces to the rest of the hull in concentrated area that are too far spread apart.
I don't like to be critical but that is just an awful design. The starboard thing is not helping in any way structurally. You cant cantilever an outboard on a bracket/lift without something more significant back there. Thickness of the transom is only one part of it.
You really need to add some knees or boxes or both.
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