LOL. Oh, man... Um, there is a better way for the Rocket SDI, actually a couple. As for the BlackMagic HDMI ports, there really isn't -- gotta run them out either through an optical bay slot or modify a side panel. If you have more than one Mac pro of the same vintage, spare a side panel. That way if you need to take the system in for service, you can at least bring it with a clean side panel and not void your AppleCare.
For the Rocket, the easiest way is to just nip off the large BNC ends of the included cables and run them out through any of the tiny holes on the rear of the case and then re-crimp on new BNC ends made for 23AWG mini-COAX. I've done that on a couple systems for people. On my primary Mac Pro, I just ran the BNC ends out through the slot cover on my ATTO SAS card. It has a small round hole in it for some reason and big enough I can pass the mini-BINC connectors through one at a time.
Do you have any grounding /short issues on those HDMI plugs? It seems like you might the way they're mounted in that side panel...





