I haven't seen folks fabricating DVI cables, and at any significant length you get up against the rated limits of the interface (making a manufactured cable a safer approach, since you don't have any tolerance for error left). I also haven't seen the parts, for that matter - no wall plates, no loose connectors. Sorry. Here\'s a 10-meter DVI for $110, if it helps. Also, do you know if you will be using DVI or HDMI for the display device? HDMI cables have a much smaller connector, making them easier to pull through conduit.

That reminds me of something I've been mulling over lately... For runs to projectors, even with DVI at both ends it might be easier to use HDMI cables and simply toss in an adapter at either end that has DVI. I can't find a reason why it would not work (although for runs long enough to exceed the DVI standard you may have problems, but that would be true anyway).