Step 1: Components
4 nuts and bolts about 2" long to fit holes in utensil holder..
If you want to make it more portable, I'd suggest you use wing-nuts to tighten up the bolts. As I'm so pleased with it I will be making a base for it out of an upside down steel plate drilled to accept the bolts so it will both protect any grass it is on and also make it more stable.
I've yet to try it with charcoal but I suspect it will work fine. As to why do this and not make it from some cans, which cost nothing? It's more durable being stainless steel and is thicker than a tin can. Plus, you can buy these pretty much anywhere real cheap and not need to work them in any way.
I didn't want it to cook on. I just like to have a small fire burning and most sites here will let you have one so long as it's not on the ground. However, with a bolted on upside down plate it will be very stable and it would be easy to rig a wire pot holder on top of it.