The other image...

EDIT: Just had a bit of a play, and it looks like it would fit IF I glue the side receiving rails so they are hard up against the inside edge. It may be as simple as having the route in *slightly* the wrong spot. Squeezing the "sides inwards" should solve the problem.

I'll hunt down some glue tomorrow and give it a shot. Any recommendations for attaching plastic to wood?

EDIT: It was indeed the receiving channels (side). I used some screws to "push" the rail as far across as it would go and now the glass fits. Just, but it does fit.

SO...if anybody else is after non-standard or just some "cheap" playfields, let me know. I need to order some more anyway, might as well tack on to the same order.