Reddit mentions of CablesOnline 1ft Hi-Speed HDMI 1.4 w/Ethernet Channel M to F Panel Mount Extension Cable, (H4-P001)

• Firebox X550e Case
  
• Gigabyte GA-H97M-HD3 Micro ATX Motherboard
  
• Intel Xeon E3-1245 v3 CPU
  
• 2x4GB DDR3 PC3-12800 DIMMs
  
• Kingston 120GB SSD
  
• Dynatron K199 1U Active Blower CPU Cooler
  
• FSP Group Mini ITX/Flex ATX 400W Power Supply (FSP400-60FGGBA)
  
• EZDIY PCIe 16x Flexible Card Extension Port Adapter/High Speed Riser - 25cm
  
• Compulab Remote power button (modified, soldered onto MB Header Jumper)
  
• Panel Mount Dual USB Jack
  
• Panel Mount HDMI Jack
  
• 90 Degree HDMI adapter (I also used an HDMI Extension cable from a first-gen Chromecast, because of where I decided to put the panel-mount HDMI. Had I cut a hole in the metal case for it by the PSU I'd have not needed it.)
  
  Edit: Oh yeah, and the NIC... forgot about that since that was eBay and not Amazon. =P
  
  
• Dell/Intel PRO/1000 VT Quad-Port Gigabit NIC - YT674

I am doing the same thing. I ordered:

USB extenders
http://www.amazon.com/gp/product/B00NIH1PZ6

Ethernet extender
http://www.aliexpress.com/item/30CM-0-3M-RJ45-Male-to-Female-Screw-Panel-Mount-Ethernet-LAN-Network-Extension-Cable-69081/32367519793.html

After trying this HDMI extender
http://www.amazon.com/gp/product/B00DHO3DGY

I found the cable was too stiff to bend properly in my case.
I decided to go with this HDMI cable
http://www.aliexpress.com/item/0-3m-1m-1-5m-2m-3m-5m-Slim-HDMI-Cable-with-Ethernet-1-4-for/32511838581.html

and this coupler
http://www.amazon.com/gp/product/B00QHF3VNK

I also got this right angle connector in case I need it
http://www.amazon.com/gp/product/B002LJNKNM

This one too
http://www.amazon.com/gp/product/B002K8H7XS

I am using a separate power board, the ATXRaspi
http://lowpowerlab.com/atxraspi/

You would need a separate power button (momentary on), LED is optional. They sell one in their store.