Yes we have thought of that. We constructed a frame in which al the components fit. De whole crate kan be simply clicked in position. That way we can interchange the crate without a problem.
I will take the more expensive motor driver. We are really going to push the limits so a little extra safety is welcome.
We have got 2 12V batteries to connect to the 24V motor. Can I also connect one of those those to the arduino for power supply? Or should I create another 5V circuit with different batteries?