[MrRoboSteve]

A couple notes I see:

Radio: good location. Can't quite tell from photo whether the other Ethernet ports on the radio are accessible -- you should set it up so that you can tether your driver station to the radio, not to the roboRIO. It's cheaper/easier to replace the radio when someone trips over your tether.

Use electrical tape to fasten the barrel connector into the radio. They occasionally come out.

Most teams use Velcro to attach the radio to the board -- easier to remove the radio and take it to the programming station at competitions. We mount ours with the white side to the robot. Use a sharpie and write your team number and 2015 on the radio and your roboRIO. Do not cover up the label on the radio that indicates the model and version number -- needs to be visible for inspection purposes.

If you make a short cat5/6 cable, be sure you're using stranded and not solid wire (more reliable). Personally I'd buy one rather than making it.

You'll want your vertical board fairly rigid if you're going to have the navX installed in that location.

Be sure you have good tie down locations for the load side wiring on your speed controllers -- not a lot of room in the photo you're showing. You'll want to both make those wires into bundles and have them tied down within a couple inches of the controller -- the screw terminals tend to work themselves loose.