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.
https://libreleaf.com/making-biochar-on-the-cheap/
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