That guy does amazing work with his mini cabs. I'd totally love one if not for it being video pinball (i like vg pinball, haven't tried the mame stuff, but it's still not the same). Only major thing I think he should revise is the shake buttons. He should just install an accelerometer in there and make a change to the emu to read it in as an analog value (if it doesn't already).
Sweet! I want one like this, too! At least it's more playable than "pocket" arcade cabinets which are made for posing mainly.