what is your current setup? My Jeep is getting a revamp of all my various 12v accessories (4 pairs of offroad lights, led flasher for brake lights/turns, air compressor, etc) using a radio shack project box. I'm using a power distribution block (this guy http://www.easternmarine.com/8-Way-ATO/ ... -54-418-0/
) set up for (up to) 8 fused terminals, from the terminals they go directly to the relays located inside the box. Not exactly all in one, but fairly low profile and cheap.
http://fitchva.com/jeep/gallery/main.ph ... alNumber=3
this photo kinda explains the layout. Not my pic, this guy is using a 6-gang block and added a 7th relay with its own fuse. You can see the daisy-chained grounds for the relays in pale green, and the relay triggers using the small gauge wiring (this guy actually used cat5 ethernet cable for the run from the switch panel, cool idea) and the power from the fuses with the red wiring. Of course, the final runs from the relay to the accessories weren't set up in this pic, but you get the idea. Notch a few holes of whatever size you want in the side of the box to run the wiring through and mount it somewhere. This guy tried using velcro (ahem, "hook and loop tape") to secure everything but the tension from the thicker gauge wiring pulled the relays in various directions. I'm using the dual-lock stuff from 3M, but he bent an aluminum bracket to hold things in place. If you're still reading this, and bored... his article about it is here: http://fitchva.com/jeep/?p=60