I'm the same. Tinker too much to use fixed decks. I've made some custom cedar "trays" out of planed cedar fenceboard. They fit inside the rails just outside my cooler. These provide convenient strap points for my pelicans
Each ammo can weighs about 20lbs. A pelican 1550 (comparable inside dims) weighs about 10. I drilled pin mounts in the rib so the cases can be strapped down yet still opened. I use one for the lid on my ecosafe and the other holds everclear.
I have a couple of 1520's (tsa carryons) with lid organizers. A pair of these holds all the cooking gear (minus stove and pots) but organizes well as a kitchen box
I use a large popcorn tin that holds my ashes. I can set in shallow water to snuff out / cool the ashes without warping the tin. Next morning i place the tin in a 5 gallon bucket with a gamma lid
I use the ecosafe without an ammo can
Hey, if you want me to take a dump in a box and mark it "guaranteed", I will. I got spare time.