hey De@no what did you use as mounting points for your draws?
In my shorty there were at least 3 8mm bolts behind the rear seat, lift up the carpet to see them all.
You could drill holes in the floor and install rivnuts but you'd have to remove the fuel tank to be able to paint the holes.
http://i.imgur.com/NbeKY4a.jpg
These were my drawers which fit behind the seats (there arent in the photo), its just 3 plastic tubs in some carpeted plywood. There is a compressor on the right and a 10L jerry can fits on the left
http://i.imgur.com/fVDJQyp.jpg
Then i removed the rear seats and made another box with hatches. A shovel axe and saw fit in the smaller compartment.
I've since gotten a fridge which sits on top with two swags on the right hand side. Three 20L jerry cans fit behind the seats.
All up my drawers cost $70, but next time i'd spend the money and get proper slides.
I reckon put a second battery under the bonnet, less wiring and no worries about fumes.
As for water tanks i've got a 12V pump i'm yet to install so i can pump the jerry cans without moving them.