First, I procured a piece of very, very fine stainless steel mesh. This particular mesh is a filter mesh; it's 80 Mesh / 177 Micron Screen (very very fine). The sea salt I'm using will sit in here without a problem; you could put table salt in this and it wouldn't go through. The edges are pretty sharp, however, so first:
I use a ruler to fold the edges over. I actually fold them twice over, so that the raw edge is completely covered
Now I use a wet erase marker and the ruler to mark two inches in, to make the folds for the sides.
I fold along the ruler, making the corners into triangles.
And here is the fully folded box.
I still need something to hold the corners together and down; I've decided to hand-rivet the corners with brass rivets. It'll be safe for food, but soft enough I can do the riveting by hand. First I'll have to make holes for the rivets.
I use a 1/16th inch punch to mark where to make the individual holes. The punch isn't strong enough to do all the holes at once (and probably won't be terribly good at punching paper after this...)
I punch through at the indentations.
Here I put the rivet thru the holes in one corner, and prepare to set it with a hand-riveting set.
The completed box!
Here's the box on the grill, with the wood smoking away.
And here's the salt added. None of it fell through at all!
A couple of hours later, the completed salt (still hot). The box obviously looks used/smoked, but it worked like a champ.
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