I had given it serious thought off and on again over the years. There are a few very interesting commercial designs if you can find them.
Unfortunately, I've grown to discover that I largely prefer rooms that
don't have furniture cluttering up the center of the floor. I prefer to have everything off against the walls. My wife, however, really likes "traditional" layouts that often involve furniture taking up some portion of the main floor in a room. eg a coffee table between the couch & TV. The original round cocktail I modeled was absolutely not conducive to this kind of layout.
However, the tables I spotted were a little bit larger, generally in the same vein as coffee tables, none quite as small as what you have pictured there. On that note, what cabs are they?
I dug through some of my old notes and I did find a couple of links:
The last post was in 2010 so...
http://underdesign.wordpress.com/2010/04/03/building-my-cocktail-mame-arcade-cabinet-on-the-cheap-part-1/Then there was someone who did place a round or oval glass on top of an old cocktail but I can't seem to find the link anymore
However, the main reason why I keep revisiting the round cocktail is the table top made by
Rotor Table Games Inc.