It seems to me it takes much more mechanical aptitude just to roast coffee, the SC/TO mod is much easier, very simple process to build. I have built many of them for family and friends and would be happy to modify a stir crazy for you, PM me if I can help.
Cheers
Rich
So many variables in roasting coffee to get it rite, I guess that is what I mean by "mechanical aptitude in roasting" took me several roast and several hours of studying to figure it out, that was about 5 years ago, Human manual pid input is the only way to really learn roasting, SC/TO gives you that flexibility. It was easy to get up to speed on my drum roaster from what I learned on the SC/TO.