I gotta say, go for the marquee. I have a build very similar to this one:

Dimensions are 11" wide x 20.5" tall x 19" deep. Go for it. I even jammed in a CRT monitor and the whole thing is pretty small.
Lew, was going to comment in your thread for that cab, but would have been a major thread revive. Anyhow, that's awesome, I haven't seen too many bartops here with a real CRT. I would say it's a shame you can't do native res on that, but with the screen size you wouldn't be able to see much difference anyway. The only thing I would change is to add two more action buttons, then you could play all kinds of vertical shmups.
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Unstupid, I love the shape, and I'd have to agree with everyone the someone would love to have the empty cab, even if it does need specific parts. They could make it work, don't trash it!
Heck, you sell it like that, and use the money to rebuy the parts.
The only thing to me is the coin mech on the side. It's kind of a reach, and you couldn't line a few of these up next to each other like that. How about just a simple coin entry plate on the CP, top left. The coin could fall through a very short chute with a microswitch in it.
http://na.suzohapp.com/electrical_supplies/42107500.htm