you should be able to attach one of those to just about any cabinet...some may require a few modifications, but it shouldn't be too bad. however if you are looking for cabinet plans, does that mean you are planning on building a cabinet from scratch? if so, you should consider building your own control panel. it really isn't as difficult as you would think, and it is a great experience. way easier than building a cabinet from scratch.
alot of people will tell you that the x-arcade stuff is not great. i have their two player unit that i gutted and installed those components into a panel that i built. i am pretty happy with them, however the wiring is a pain in the butt if you want to move the controls apart. that xxl panel is nice, but the controls are pretty close together, with alot of wasted space on either side. just be aware that it could be a little crowded with two adults trying to use it at the same time.
i have been using my x-arcade stuff for a while and it has been working just fine, however i want to make my panel a little different and i dont' want to go through the wiring mess again, so i am buying an ipac and happ sticks/buttons this time around....if i had it to do all over again, i would have skipped teh x-arcade and went right to the good stuff. however if it weren't for the x-arcade stick, i may have never found this site and may not have my own cabinet right now.
so since you already bought it, use it for a while, i'd be willign to bet that after a while you will want to build your own panel, at that point you can always sell your x-arcade on ebay or something like that.