It looks like the bottom would fit 1/8", yeah. The top, I took an 1/8" piece of plexi and fit it in and there was some wiggle room so that's why I was checking. I find it unique on this cab that the bezel art does not sit up right against the glass, at least on the top, though I guess games like Frogger do this as well.
The HS-1 and HS-5s I have use 1/8" I think. I'll probably get some 1/8" tempered clear glass for this 23 x 24.75.
The fit in the control panel where other standard leaf buttons do not (as the width is like microswitch buttons and style is like the leaf buttons found on Star Trek).