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I was inspired by Larry Cotten to build a similar roaster. I used his previous design that uses a smaller set of paddles. In the video below the roaster is working, but in a sort of prototype stage. The foil extension was replaced with a section of flashing.

because my paddles were made from the cover of an old hard drive it was not exactly flat the paddles shifted on the shaft. It was serendipity because the angled paddles allow me to roast up to one pound of coffee. The battery operated screwdriver is marginally strong enough to do one pound and it is happier with a little less. I quit working on this roaster when I got my fluid bed roaster finished.