Made Base and Hopper setup for a new MM3 today, using 5 Gallon water bottle for the hopper. Where the hopper attaches i have relieved the wood so grain can flow to the full width of the mill. I drilled a hole in the base so i can hang it on the wall when not in use.
The Sides sit in a dado and can easily be opened for cleaning by sliding (the side with the setscrews you need to remove the set screws to remove the side panel)
I replaced the set screws with 1/4 20 hand wheels for easier use.
The underside of the base has a routed groove so it fits securely on a bucket.