[DawidvC]

If I may assume that speaking about the front, you are meaning the Drive End (i.e. the part where the shaft exits that is going to be connected to the gearbox, and NOT the part that house the brushes) AND we can assume that the motor is wired standard, then your drawing would be correct.

Regards
Dawid

 

[DawidvC]

To see how much that motor can be overvolted, you need to know the voltage / frequency ratio of that motor. This can be calculated if you know what the base speed of the motor is. That should normally be the speed (in rpm) where the torque would start to fall off. Using that speed and knowing how many pole-pairs the motor has, would allow you to calculate the frequency needed to achieve base speed, and thence your v/f ratio.

Good luck with your build
Dawid