cutting sheet plastic.

[eightyeightfan1]

Here's a method called "jigsaw puzzle"


Drill two holes for the size you need, where you need them. Go slow when drilling through plastic.
Cut the plastic in a straight line through the diameter of the circles.
   

Take another sheet of plastic, and splice it to the edge of the cut plastic. Make sure you re-enforce the splice line with scrap plastic.
   


Hope this helps.