Ebay was running a great deal on refurbished 2nd gen Nexus 7's, so I thought it would be a great time to step away from my HoTT telemetry (and the headache of constantly making the module work with the arducopter code) and upgrade to DroidPlanner2 and the new 3DR radio!
There were a few posts about people doing this, with some very great ideas with varying complexity. Hobbyking also has a carbon fiber solution for this (I ordered, but decided I couldn't wait).
I am in the process of building myself a CNC (but I also couldn't wait to be finished with that). The mount is pretty simple, I have a lot of aluminum flats of varying sizes that I got from Lowes for some frame builds, with a little bit of measuring, a pencil, bandsaw, sander and file I crafted this. It turned out to be very rigid, even without any horizontal bracing.
More at my project blog!