Spuds... nice job...you have inspired me to follow through with a brick rocket stove...most of the brick models I've seen don't have the air supply channel underneath... I think several short sections of 3/4" pipe laid on the bottom would improve efficiency...something to think about ... hurricane season in 3 months...I like the idea of the taller 24 brick models..other videos show a better overlap of brick seams

http://www.youtube.com/watch?v=fz2ssyGfg58