I read about making sure you don't get heat build up in your cabinet.  Well since I was building this for my house I figured I had an easy solution for that.  I just didn't bother putting a back on the cabinet.   This makes the whole thing lighter anyway.   One of the nice things about this is that you can easily take the components (and monitor) right out of the cabinet and it's then pretty light and easy to move.  Not like trying to move that old asteroids game at all.

Turns out there is plenty of room on the inside.  The photo makes it look like there's a lot of wires (some are shadows from the flash), but its not bad.  Its so roomy that I didn't bother to tie them all down, so they are mostly just floating.