I still have the same ole MAME cabinets I had... well, except for the vertical MAME which went away a couple years back. After getting hit with the "arcade" bug, I really didn't do much to either of my MAME cabinets. They're both still fully functional though and still get play.
I DID modify my cocktail MAME cabinet to also be my NAOMI "server" of sorts. I netboot to my NAOMI cabinet using my MAME cocktail cabinet (and Mamewah front end).... here is a little video of how it works...