Thanks for the tip re the towel as insulation, I know it's gas but it may well solve the Outdoorchef problem. (I will remember to leave a slightly larger gap to let the waste gas out)
Or why not do it proper job, and build your own wood oven, took me 4 days and limited building skills! It's great using the charcoal from this, straight into the smoker, and carry on cooking in that.