I just replaced my Target Alpha banks - and also agree that you really don't have to cut anything. What I did to provide more room in the frame to get those targets in and out, is replace the machine screws that hold the frame together, with longer screws, and just screwed them in enough to hold... that way the frame gives much more, allowing the targets to come out with ease... I did all that work in about 25 minutes, easy squeezy - with no cuts.
Also a proud owner of a Jumping Jack - long term owner; still play it too.