Glad you guys like it. However, let me warn you that more experimentation has added to the cost and weight of this stove. It isn't the box alone.
After the initial experiments, I found the pot or kettle had to be raised another half an inch to lessen soot and improve combustion. So I added this raised cover and drilled a few holes on two sides ( they may improve combustion and ventillation although not really necessry as kettles are round and the square corners are good enough for ventillation).
Drilling holes is cumbersome and a better alternative I did : install two parallel pieces of metal wire (coat hanger) across the cover (through the small holes)to raise the pot a little and gurantee more ventillation. These small wires also serve as guards to keep fuel tabs and/or box of matches stored INSIDE the box when not in use.
I ahave used only two diagonal screws to hold the cover to the box and didn't tighten those screws.
After some successful initial attempts, I thought to add 4 screws on the bottom of the box itself to raise it off the ground and allow bottom ventillation, but I got lazy and preferred to spend more time relaxing and drinking tea than inventing and perfecting.
On the plus side, this homemade Esbit stove can store more fuel tabs than the original foldable Esbit stove. Also, it is near indestructible.
Negative side, weight, if you are hiking.