I have only used the 50 gallon drum conversion. I think you can used them on the smaller drums too.
get the barrel for free and about 50$ for the kit. then you'll need black 6" pipe and some elbows. I use a china cap as my pipe goes out the roof and not the side. out the side you'll need a support/steak.
On my last section of the 6" chimney pipe, I drilled about 20, 1/2" holes in to get extra air in the pipe to burn off embers before exiting..
I also installed a piece of 1/4", 12x12 steel plate on top that my buddy had laying around. On this we put on a Big pot with a spout for our hot water.

Last edited by Dre; 08/30/17.
All of them do something better than the 30-06, but none of them do everything as well.