We always try to place all of our electronics on the robot's baseplate. This year and last year, they were on a waterjetted aluminum plate with pre-drilled mounting holes for everything. All of the holes are then tapped and we screw the components into them. The cRio was isolated with a rubber pad, although the powdercoat is not conductive.
Wires are run so that they can be easily traced by looking at them. Zip ties are used when necessary.
Here's this year's board without the cRio. Some of it needs to be tidied up, but its mostly done except for the wires in the bottom left corner.
-Nick