I just finished building my grain mill. I found a 12 volt motor that puts out 70 foot pounds of torque, a long ways from the first gear motor I tried... I had a guy in our sheet metal shop design the grain funnel so it holds roughly 20#'s of grain. The grain funnel empties into a soap dish interior shaped plastic part that disperses the grain over the length of the rollers. Knurled rollers are adjustable on excentrics and are 303 SS. Body of the grain mill is 1/2" aluminum plate.