Well, I got myself an interesting predicament...
The poweredUSB card, while it has a physical PCI slot, doesn't actually use the PCI connector. It basically uses a "double" USB 2.0 header on the top of the back half of the card.
The case has 1 USB 2.0 front panel connector.
The motherboard has only one USB 2.0 header.
The PCIe slot is going to be used for the external burner box and PCIe SATA card.
The solution I came up with was a custom USB hub that plugs and mounts directly onto the poweredUSB card... which I might need a little help designing.
Oh, and I finally looked at the video. That arm might actually work for me! (The disk grabber, but not necessarily the whole thing...