Seeing my sketches are so bad, ideas are via photos and descriptions for now.. Slide out kitchen on passenger side as narrow as possible. stove on the end and pantry plus cookware at front. including removable slide out table underneath this, perhaps.
Long storage at back above wheel well including removable brackets for storage of fishing rods etc, include one removable access hatch under seating for access to pantry area while drawer is shut for making morning coffee, and shitty weather eating. Board for making extra bed needs to be split in half to allow opening access hatch while you’re standing on the floor.
Drivers side storage large and similar shape to this one, full height storage behind driver seat up to height of bed, mainly drawers in behind drivers seat for clothes, towels, spare bedding etc.
Slide out table as above, also the tall skinny door forward of it for storing longer or taller items. Sink in second level as the above photo.. Sink handy for indoor cooking during bad weather, morning coffee, brushing teeth, putting fruit basket into while travelling etc..
Last section closest to back door, probably small shelf at top level just the right size to slide in the single gas canister stove, slide it out, sit it on top make coffee, cook etc… Below this one drawer for easy access often used things, then below probably a open area for boots, shoes etc..
Fridge up the front like this layout, comfy cushions on seat.. Quick fold down table on back door as above.
Wrap around 270 degree awning…
Storage space at rear of cabinet like here for canvas storer and strapping on other things.
Also space behind drivers seat for another storage hanger plus tripod etc…
Would expect water storage to be in the wasted space behind this drivers side cabinet either side of wheel well.. At least 60L..
Solar panel on tilt up roof.
Storage box towards front of roof for fossicking gear, wellies, dirty crap stuff.
120AH deep cycle battery
numerous 12v and usb outlets around vehicle.
Sufficient LED lighting throughout