In the above picture the small box on the left against the cargo barrier will house a 10" sub and the box to the right of it a blue top Optima D34 plus 10 way fuse box.
The cavity that runs alongside the fuel filler leaves enough room for this 4channel amp:
http://mosconi-america.com/m754.html - which will run the front splits and the sub just nicely (I have also upgraded the rear pod speakers but they will be powered off the deck)
The cavity to the far side gives plenty of room for a 12v compressor, I'm thinking the Tigerz11 thumper when it's back in stock as it seems unparalleled at under $150
Pic below shows the lid assembled which is 3 panels, main L and R which are screwed in and rear R which will lift out for access to the aux power system