OK. How to....
1. Chop your gas bottle in half. Usual warnings.. VENT then WASH OUT your bottle THOROUGHLY before cutting. I used a cut off wheel on my 4" angle grinder. Bloody steel is harder than it looks..
Then smooth off the cut edge (grinder and/or file)
2. Drill some breather holes in the bottom.
3. You will need 2 pieces of mesh, one slightly smaller than the other. The idea is one piece of mesh supports the trivett, which the heat beads rest on. The other piece sits above the heat beads and supports the camp oven. Don't want the oven sitting directly on the beads as it might become unstable as the beads burn away.
The photos should show what I mean...
That's it for building.
To use it 1st get some heat beads going I use a Heat Bead Chimney. A few fire lighters underneath does the trick.
The amount of beads you need depends on what you are cooking. This app
Dutch Oven Gourmet is a quick and easy way to work it out.
When the beads have ashed over place the appropriate number on the trivett for the bottom and the rest go on the lid.
Load up your camp oven with whatever you want, sit back with your favourite beverage and enjoy the smells