Thanks, it was pretty simple to build and really cheap. Plus all the materials were easy to find. No special tools needed. The most expensive and difficult to install component was the 8in stainless steel chimney liner. I needed some help from another person to install it. I chose to do pea gravel in case it didn't work well or I decided to remove it in the future. Cob would work even better and we would probably burn much less wood. Cob is a lot more permanent though. If I build another one I am confident enough to build it with cob.