I was going to build a mk3 cabinet when I first got into this. I had a deal for $150 for the complete cabinet with monitor working. (that was 4 years ago). I was going to buy it, but the same guy had this Jamma cabinet that was set up for some 2 player 6 button fighter with no side art, controls, or board. It did include the 34" monitor and the Jamma harness. The cabinet is made out of plywood instaid of particle board. I reworked the control panel to still retain the same control configuration, but have room for more stuff - trackball, more buttons, etc. I attached a pic of before and after the cpanel mod.
The moral of the story is, you should find a cab that you like to look at. You can always modify the cpanel to accommodate more players, controls, etc. Just a little imagination - that's part of the fun!!