I have a home built Grandby with the bed down. I store most stuff in plastic bins that fit into cabinets:
Cooking bin: Pots, pans, plates.
Drink bin: Stove & fuel canister, coffee fixings. This, along with cooking bin is stored in cabinet under left side counter.
Clothes. I have 3 of these. They fit under the bed. Underwear, socks, t-shirts, rain gear, cold weather gear is stored under the right side seat for easy access.
Daily personal bin: teeth cleaning, shaving, comb and hair brush. I have 5 more of these for: shower stuff, dog stuff, misc stuff, small camper stuff. Stored in cabinet under refrigerator.
Canned goods, boxed food and other non-refrigerated food is stored wherever they fit in cupboards.
Silverware and utensils are in a drawer.
Big stuff, like Mr. Buddy, axe, shovel, my small grill, etc. are stored in compartments under the bed.
Simon has his own compartment near the door for food bowl, water bowl, tether, etc.
Sorry my pictures aren't
in situ. The camper is in the shop for repairs.
jim