Haven't done it myself, but I plan on doing something similar with some plugs to my Macbook OR buying a Mac Mini and turning it into a multimedia deal... Well, Macs already have Front Row and a remote, so I should be good. How many watts does the PS 2/3 use? I think the built in AC outlet is only good for charging laptops and such. I would buy another inverter of the proper capacity and wire it properly, fuse it, run it from a switched source, etc. Screens, I am wanting mine to be accessible by the driver too, so I was gonna do 2-3. One in the center stack, might use the useless cubby under the radio, and either one center mounted in the back OR one in/on each headrest. Soundwise, you could probably get away with using a line in deal connected to the back of the radio and use an RCA-3.5mm adapter. OR, if you wish to get really nice, bluetooth headsets???
1998 TJ Wrangler SE - Stone White, 2.5Ls of screaming lifter clacking power, AX5, 31" BFGoodrich All Terrain T/A KOs
2010 Wrangler Unlimited Sahara - Deep Water Blue, 3.8Ls of oil consuming fury, NSG-370, BFGoodrich Rugged Terrain T/A 265/70/R18s