When I got ready to set up my DR11, I put adjustable feet on the cabinet. The bolts were 1/2-13 thread on solid steel feet, not rubber, because I wanted to minimize any movement or settling that eventually occurs with rubber. I didn't want to bolt down the lathe, because I knew I would be moving soon. As it turned out, the feet raised the lathe about 2" and made it rather tall for me to comfortably work with, besides the fact that I felt like it made the lathe less steady (the cabinet is rather narrow to begin with) and more prone to vibration. In the end I removed the adjustable feet and set the cabinet on the concrete. I would have shimmed and bolted it in my new location, but ended up selling it before I got the chance (miss that lathe). There really is no need to level the cabinet more accurately than with just a carpenter level, since the DR11 has leveling feet on the lathe bed. Bolt the cabinet down and shim it so it is roughly level and does not rock, then use the machinist level to level the lathe bed using the leveling bolts on the bed. Doing that will make the machine much more solid-feeling and minimize vibration that comes from the Reeve's drive system. Just my opinion, based on my experience with the same decision you are making.