I would not recommend running wires through tubes, our electronics layout this year was the cleanest it has ever been. Our frame this year was constructed of perforated tubes, so it was a simple matter to zip tie the wires to the tubes every 2-3 inches. In some places we routed wires through the tubes, but only because of how open and pocketed they were.
This is a picture of our robot with the old bridge lowering device, most of the motors were close to our dual electronics boards, but those that weren't were simple to wire because of the ability to zip tie everything through the holes.
http://farm8.staticflickr.com/7188/6...a3d21afd76.jpg
Another dis-advantage to running wire through tubes is that the inside of tubes tend to attract metal shavings.