Hello, in my opinion I don't think it will work, personally I removed all the metal structure to keep only the PCIX socket with the cable because it prevented me from connecting any PCI Express and I placed it vertically but also this system is made for the Phantek model Enthoo pro 2 on this model you have the possibility of placing two cards max vertically. So maybe if you tinker it could work but it will be at your own risk, but one thing is for sure it will take up all your space, you won't be able to connect PCIexpress.
I hope this helps, good luck.