Probat uses solid cast Iron drums, I would try to do as much as possible what Probat does. I am waiting for someone who is converting from skillet roasting to glue a bunch of Iron skillets together for a BBQ drum.
I am thinking about this. I currently roast 1# at a time with a skillet. Dont really need to go for more, except days like today. I did 3# and was bored with stirring after a while.
I am thinking well casing. Then for heat I am thinking turkey fryer burner thingy, which I use now. Depends on the length of the casing. I would think by preheating it and not having perforations.......and some way to spin the thing. Just thinking out loud here.
Also been playing with the idea of taking a big disk [read farm implement disk, about 20" diameter] and welding 4" sides on it and using it as a big 'wok' type deal.
Any thoughts?