I'll answer my own question and confirm it would fit...with just a few mms to spare on the width, so don't know how a bezel would look.
I was skeptical about Arcade1up, but really impressed with this wee cab, especially the trackball which is very smooth and good quality.
My only gripe - if you're tall you have to use a stool as the marquee juts out and blocks your view of the very top of the monitor.
I plan to mod it into a MAME cab with an additional flight stick.
That way I will have covered most of the MAME games which use spinner, trackball or/and top-down fire joystick (even twin stickers like BattleZone).