I just saw your pics. They weren't showing up last time I looked for some reason. I have to point out that your v is supposed to be in the back of your inner barrel. You want to burn from the front to back. Thats how barrels stoves are designed. The air intake comes in the bottom and the draft draws it from the front burning to the back then up through the outer barrel which should have the collar on the front. With the v in the front of the inner barrel its just going to draft straight up into the outer and out. It may also be difficult to get a good burn going with out a draft across the fire. You did really good work. I just think the implementation is a bit backwards. If it doesn't work well you might try reversing it.