I've seen some pretty cool home-made kitchen boxes. I think a lot of scout troops build them for their own use.
My car-camping setup
2- Buckets or Rubbermaid Bins for wash/rinse basins, storage (note, I usually just wipe down most stuff and re-wipe with vinegar, esp. when water is scarce). Buckets are great for storing lanterns. Pad them with table cloths/tarps/whatever.
1-Oversized strainer for straining gray water. Scrap window screen or old netting also works.
1-Roll-up camp table, folding table or wire shelving piece with improvised legs.
1-Luxury item ---> Coleman propane
instant hot water heater for showers and kitchen. Of course, black buckets or black shower bags are also handy.
1- Sterilite Drawers for camp plates/bowls/cups/flatware/soap kits etc, though to be honest I find that they can be space-wasters ....balance that out with being able to see into drawers, and not having to unstack and re-stack bins all the time.
1-Camp stove. Honestly, most of the time a single-burner is just fine.
1-Vinegar. With these last two you can clean up anything without having to do much rinsing, and also help relieve bug stings.
When I bring along a 10x10 pop-up, or just run a tarp off my truck's roof rack, I'll string nylon cord or cargo netting and use keychain-sized carabiners to hold utensils and lighting
in place. Lengths of PVC on cord make great paper roll holders.
It all comes down to what's easiest for you, and how you define "convenience".