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Sonny posted here, but ran afoul of the forum rules. His YouTube video's can be found by searching "DIY 002 coffee roaster". An in-person hands on observation goes a long way, if someone was really seriously considering his machine. Like I said, the DIY might have some appeal to a member who wants some hands on experience, but doesn't have the tools or know how with metalworking. It's good to have options, and he appears to be experimenting with electric elements according to his blog.

There are coffee roasters, cafe's with coffee roasters, commercial coffee roaster manufacturers, smaller roaster builders such as: Quest m3, Huky, Rotate Fun, Bullet R1, Mercury, DIY 002, and more in Taiwan. It's impressive indeed, especially in the roasting end of the spectrum.