I'm interested to see if there's a non-destructive way to remove those PCI-e cables.
Have you considered just tucking the PCI-e cables between the PSU and the 2.5" cage, right against the edge of the case? They would hardly take up any room, and besides, you'll have to run most/all of the other PSU cables across the case anyway.
Interested to see what you end up doing all the same.
Yes, my first thought is to tuck the PCI-e cables as you described, and I will give that a good, hard, look during the assembly process. One issue regarding tucking the cables there is that I also plan to tuck the cables that have the molex connectors there. I will probably use one of the molex connectors with a SATA power adapter to power two of the drives in the 2.5 inch bay, so the space between the power supply and the 2.5 inch cage is a natural for storing the excess molex connector cable.
I will be installing a TV tuner card in the PCI-e slot. It appears that there will be no space above the tuner card to run cables, so that means that all of the power supply to motherboard wiring will have to snake from the power supply past the front of the 2.5 inch drive cage, then around the back of the TV tuner cage, and on to the motherboard. This will make that area in front of the 2.5 inch drive cage rather cluttered, but I will manage.
I have all parts on hand now except for the motherboard, which is scheduled to arrive on 22 Feb, but it will probably get here a day or two sooner than that I would think.