2 gauge seem real big. What are your planning to run at 100 amps. Or is that max. You know that the stock TJ power ground wires are only 8 gauge. And I bet 8 or 6 would be all you need for most stuff. If your really putting out 100 amp's extra I'd be worried about the alternator and battery.
Have you seen this fuse/relay box? 105 shipped. I believe they rate it at 60 amp max and use 10 gauge main power.
edit: 2 gauge is more than some winches use.