I used to run something similar. The mill belonged to a buddy and I had to give it back when he decided to get back into the hobby. The low rpm gear motor was a perfect match for the JSP mill. I absolutely loved the setup. It wasn't very fast; I think the speed was around 100 rpm but it was quiet and smooth, and it created almost zero airborne dust. I've been scouring used machinery sites along with ebay looking for a similar motor.
It was a pretty safe setup as far as loose clothing etc goes but if the rollers got ahold of your fingers they'd be crushed in a flash. If I were to configure one myself I'd use the exact same motor and mill but I'd put a huge hopper on it so you could set 20lbs of grain and walk away. The hopper would also help keep fingers away from the rollers.