It's 99% finished! I figured out how to do "normal mapping" in order to approximate a knurled texture. The complete working portion of the mill is shown in the first image. The second image has an end plate removed so you can see the rest of the working pieces. Third, you can see the "lugs" that the rollers will ride on (via sealed ball bearings). The last one shows the elongated holes (right side) that allow for gap adjustment. I like this design better than the eccentric adjustment design - it'll be easier to construct and very positive when tightened down.
Since it's modeled, I can provide images of any part at any angle if you're interested in more specifics.