I had pretty extensive (scribbled out) plans for just that idea, only it was a 2 player portable design. This is when I was in Baghdad, working out of the embassy waiting for my contract to end so I could EAS. I had a LOOOOT of time on my hands.....
I had all the parts sourced as well.
Essentially my idea was a flight case (like what bands use to haul speakers and soundboards around) with hinges on the top and bottom.
The top would have the LCD and CP. LCD mounted in the top of the lid, which when flipped up would lock out so there was no wobble.
The bottom "lid" would have flip down legs in a small compartment. Now, I don't mean picnic table sized folding legs, I found a great place in Missouri that sells super stable locking legs that can extend up to 36" and aren't too wide, something like 20" I believe. Also, when folded they only take up about 3".
The kicker would be that you don't HAVE to fold down the legs, you could throw the box up on a table top and open only the top compartment or bar if you wanted and play that way...
The base would have 1/8" panels as well that clipped onto to the folding legs, thus giving the impression of a solid stand. Sounds kooky, but I had everything sourced and it would have worked.
Computer is sandwiched under the CP.
I even had a retractable power cable for the thing.
Feature creep set in quickly as I started ordering everything and I ended up scrapping the idea.
It's still on the old back burner, but I simply can't see investing the kind of time and effort it would take for an idea with marginal value.
I have no doubt I could make it work, but I don't want to invest 2k getting there.
Obviously such a build wouldn't have a Marquee, and the viewing angles would be probably not as great as a regular machine, but it would be portable, about 25" wide, 21" deep and height TBD (24" ish) when closed and have embedded wheels and a side handle so you could pull the sucker like a suitcase.....
Dang now I kind of want to build the thing.