modify exisitng wood stove with flatop and top flue exit to a rocket stove

I have a conventional wood stove with a glass door and flat op with top 6" flue exit. I want to build an insulated secondary combustion chamber on top with the typical rocket stove containment vessel over top of the combustion chamber with a flue exit out the bottom/back. Makes sense to me to fill the existing fire box with extra firebrick on both sides just to make the firebox smaller. Then I have to modify the glass door to accept some kind of feed tube. Does this idea sound feasible to anyone?

Here are a couple of threads (kind of modified batch-box rocket) that may give you some ideas for improving the efficiency of the old wood fired cook stove:

http://donkey32.proboards.com/thread/1561/batch-cookstove-inspiration-firespeaking-lasse

http://donkey32.proboards.com/thread/1563/vortex-stove-variant

Your best bet

http://donkey32.proboards.com/post/16159/thread


For just a heater, i wouldn't do a short riser as he has done. But it shouldn't be too hard to retrofit bricks and all into an existing box stove, and add a side heat riser. Exactly as he has done.

You might want to read through my project's thread for another idea of how to use an existing wood stove - https://permies.com/t/40546/rocket-stoves/Convert-wood-stove-rocket-bell.

Just adding another link to another bell-on-stovetop design. It's a prototype....working pretty well for my needs in a shop space, but not really permanent. Each time I fire it up, I make sure to get the bell (barrel) around 600 - 700 degrees F (based on magentic stove-pipe type thermometer) to keep down creosote build-up. Seems to work well as is, but want to modify the door for draft entry near the bottom and add on exhaust ducting that snakes through piled brick.

https://permies.com/t/42529/rocket-stoves/FWIW-Rocket-stove-heater-concept#333627

You could also have a quick look at the Walkerstove!

https://www.google.fr/search?q=walkerstoves&biw=1024&bih=461&source=lnms&tbm=isch&sa=X&ei=vnbxVKiHKsXzUO7egKgM&ved=0CAcQ_AUoAg