For the fuse block:- in this case, there are nine (9) points of connection to the various circuits needed. Each circuit is fed by a properly amp fuse (5, 10, 15, etc.). So, it is kosher.
Regarding the rear storage area, there are three (3) components - lid, bumper and floor. The floor was part of the belly pan. The lid has a piano hinge and another piece of AL as a cover with a slight bend. I think you would be best getting a salvaged piece for this. And, in my case the bumper is Aluminum. The width of the storage case was ~61" between both 'C' channels (main support beams) and 12" deep.
I replaced my storage floor with a piece of SS expanded metal, see here - http://www.airforums.com/forums/f227...e-98742-5.html
I trust this gives you some idea what should have been back there.