The box is stronger than it looks there a frame under the ply made of 4x2s.
inside the box is the fuel tank. Leaves me lots of space, its empty now as I had transport some stuff, but SX12, vac, portable, rotary, sprayers etc will all fit in.
I included a picture of my water hose reel that has a centre feed to my water tank, save messing with a garden hose reel.