I just got the 7" x 5" x 3" Radio Shack Project Box. My 6 fuse panel and ground bar will all fit into the box, which will be wall mounted sideways on the wall. I drilled holes in both ends (one for ground and one for hot). I could probably get by with one hole, but I wanted to separate the two wires as much as possible. I am planning on velcroing the fuse panel and the ground bar to the inside of the box so I can remove and add to them when I need to. The box will also be screwed to the bulkhead, just above the battery on the passenger side of the lower galley.
I pre-wired the box and left about 6" sticking out of the end which will get stuck into a 6-point female connector. The incoming wires will get male connectors.