Okay finally got batteries for my camera (I've been very busy) and was able to take some photos out in my camping shed.
I make a double walled wood stove using a 11.5 oz coffee can that has a 1/4 inch rim around the top, you can also use a quart paint can. For the inner can I use a Progresso soup can, the soup can makes the combustion chamber. Any two cans will work, but the larger can must have a rim around the top, and the second can should fit tightly inside the larger can, and should also be slightly shorter than the outer can so that there is a gap between the bottoms of the two cans to allow air to enter the bottom of the inner can.

The first thing I do is to drill 40 - 50 1/8th inch holes in the bottom of the soup can (the smaller can). This does not have to be real neat, but a center punch used before drilling helps a lot.

If you look closely at the photo below, you can see the 1/4 inch rim I'm referring to around the top of the coffee can. This rim allows for a very tight fit between the two cans, I have to shove the soup can down inside the coffee can.

I drill 6 -3/8th inch holes around the bottom of the soup can (this can be seen in the first photo) and 8 -3/8th inch holes around the top.
I drill 6 -3/8th inch holes around the bottom of the coffee can, and that's all you have to do to the coffee can.
Below is the finished wood stove with a wire pot stand on top, the gap in the wire pot stand allows you to add wood while you are cooking if needed.

Let me explain how this works real quick.
After you have loaded the stove with bark, sticks, pine cone bits, ect. you light the fire with your tinder on top, not the bottom. As the fire gets going air is sucked in the holes at the bottom of the coffee can (outer can). This air gets super heated as it is drawn up between the walls of the two cans, part of the air goes into the tiny holes in the bottom of the inner can for primary combustion. Part of the air continues up between the two cans and comes out of the holes in the top of the inner can which you can see in the photo above. This serves two purposes, first the air coming out the top holes creates a secondary combustion at the top of the wood stove that burns so efficiently there is little or no smoke, you get complete combustion.
Second the air passing between the walls of the two cans keeps the outer can much cooler than a single wall can.
I will put up a video of the wood stove burning soon. So far I get a 30 + minute burn on one load of wood.
The first 15 - 20 minutes you get flames, then the wood turns to coals and burns another 15 minutes so hot you can not hold your hand over the stove.
Using a hand held infrared thermometer I measured the combustion temp at well over 900 F degrees. The top rim of the stove measured 473 degrees F. The outer wall of the stove measured 203 F degrees, much cooler than a single wall stove measures.
Boil times are less than 5 minutes with two cups of cold water.