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Mine is just a 55 gallon drum with a lid and some stove pipe for a chimney.

I couldn't find a 35 gallon drum for the retort so I'm using a small garbage can.

These things were already on my property when I bought it, but if I had to buy everything out would cost $100 or less

Nice. So a lot like a rocket mass heater build? I need to research plans. We do have a 55gal drum.

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There are similarities to an RMH build.

It's really simple. Holes at this top and bottom sides of the barrel.

A lid with a chimney.

A retort with a lid and 4 or 5 holes in the bottom.

I wrote an article on my website showing exactly how I made my retort. I hope it helps.