looking at the breakages, it seems to be a factor of two things.
1. Depth of the countersink, leaving it very thin in that area
2. Insufficient gearbox bracing.
The two allow it to flex, and due the T-Piece being stiff, it is snapping along the line of the front suspension brace.
I think to fully rectify the problem, you would need to beef the material up, in that area, plus give better bracing to the rear gearbox.
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