This set fits the Large Cocoa Mill.
The square base is about 12" x 12" hardwood plywood ready to bolt up to the bottom of the mill.
The two-gallon galvanized funnel mounted on plywood bolts to the top. It holds about 9 lbs of grain. The round shape makes it easily extended with a 9" diameter bucket or duct work to increase the holding capacity.
You know, the standard homebrewing mill bucket-top setup, gets you going that much quicker than making something custom.
The appearance may vary from the picture. Given the price and availability of wood these days, we are using good quality repurposed plywood.