Broken Gearbox case

[joffacn]

Hi
Looked a simple rollover but BROKE the upper half of the front gearbox.
Murhpy's law strikes - I have spare shock tower - not a gearbox.
The material is thin where the holes are drilled for the Shock tower mounting.

I will replace but any ideas of making it less likely to break?
Seems to me that the stronger the shock tower the more of these will be broken.

Cheers Jeff