I will try to explain it from an architectural point of view. Please excuse my poor technical English, I hope the content will be understandable anyway...
The cut-out is unfortunately located in a quite weak spot. If you look at the chassis and its static behaviour it can be compared to a truss which is mounted on columns at both ends. If a load is applied the truss wants to bend which generates the highest momentum just in the middle of the truss. Here the truss would need the biggest constructive height for maximum stiffness. Unfortunaltely this is close to the point where a) the motor is located on the chassis, which adds extra load and b) your chassis is cut out, which reduces constructive height dramatically.
Maybe your chassis is still strong enough, time will tell...
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