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I used a 12" duct with 6" coffee cans to form the riser
It has a crude tripwire. I fit it into a piece of duct trunk that was to be thrown away. Here is the parts after mixing and lightly packing.
![Image](http://i1320.photobucket.com/albums/u529/bobwieser/1420664393552_zpsbyk1u6kr.jpg)
The drying did test my patience and after 4 days I burned out the inners of the mold.
![Image](http://i1320.photobucket.com/albums/u529/bobwieser/1420757764710_zpsft61wreo.jpg)
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I have a thin sheet metal P channel.
I put a drum and connected a chimney to it I am shocked that it lights with 2 pages from a magazine, drafts wonderful, lots of heat and goes smoke free in short order.
The material is rather fragile but strong enough so long as you don't jam wood into the feed. It's light enough at 45# per piece to be some what portable. And the base stays cool after hours of burning. There is 4.5" under the core. Total cost $ 45.00 plus dumpster diving.