As far as inaccurate cutting -
It would seem to me to be an 'easy fix' to provide cutting mats, rulers, and rotary cutters to the workers.
If 'management' wanted to make it super simple, just provide a 'template' that is to be used
The only 'excuse' I can see for very irregular cuts would be if the workers were just 'eyeballing' the cuts instead of using some sort of measuring device.