Here's what I did.

Holds a lot of grain and only requires a final brushing of grain into the rollers when you are almost complete grinding. 5 gallon bucket (wish it were larger now) with a small rectangle cut out in the bottom right over the rollers, attached with screws and large washers, roller mill, then a round base (with another rectangle cut into it) larger than the opening of another 5 gallon bucket. I haven't changed the cardboard sides that keep the dust in the mill and bucket, but I need to... maybe with plastic or something simple.