After viewing several "models" of wood gas and alcohol stoves for camping I came up with this idea of a Hybrid Wood gas- Alcohol stove which is lightweight and it fits in the backpack without staining anything at all. I must apologize for not having a picture of the inside can, but since the first time I inserted it on the big can I had tight fit issues, when the one you see there fit perfect, I didn't want to risk removing it to take the picture and compromise the good seal it has. Again apologies for that detail, but I hope the pictures are clear enough for you to understand.
Step 1: Building the wood gas stove.
The gas stove is very simple really. I found a 1/2 gallon can and a "tall" 1/4 gallon can, which in my country are hard to find, but finally found one.
Having the 1/2 gallon can upside down, mark the diameter of the 1/4 gallon (in my case was 10 cm) as centered as possible. I marked 12 mm all around. The next step is to draw yet another circle inside the one already made, in order to make a good set of tabs to seal the inner can inside the outer can. (See figure 1)
After you draw the three lines, cut at the inner line, sand the edges that are going to be quite sharp, and using a triangular file make "v's" like the ones shown. (See Figure 2). Additionally, drill 16 1/2" holes at 1 cm from the top (remember the inner can is inserted on the bottom of the big can, that is, upside down). That is all for the 1/2 gallon can.