Stackerbox/Toughbox Integration

I was wondering if anyone has mounted a toughbox and a stackerbox together. I’m trying to get the effect of a 3 stage stackerbox, with the ability to mount 2 motors.

Any ideas on how to do this? Or is this even a good/safe idea, not sure if a 3 stage can handle 2 CIMs without failing.

Thanks for your input.