To cut the hole in the Case use the outer_ring as a template.
You can use clear glass or plexi for the window, 1-3mm should work fine. (I'm using 2mm plexi in my build)
you can print the inner ring in clear PLA or ABS if you want the inner ring to glow from the 5 5mm led mounted on the ring. If you don't want to use led then print the "inner_ring_clean.stl" instead off the "inner_ring_led.stl".
Each led are connected in serial with a resistor ( 100 ohm for Blue/green led and 150 ohm for red/yellow led, this is for "standard 5mm" led 1.8-3V). the 5 led:s are connected to each other in parallel and have a 5v feed from the PC power supply . you can buy led witch are ready for 5 or 12 V if you don't want to use a resistor.
The ribs a just a bonus if you want some easy decoration, print and cut the rib to suite your length of each rib and glue them to the case.
If you print the rib in clear plastic you can hide 3mm led or a thin led strip in the ribs slot and get a nice glowing effect.
20150910 : Another version off the inner ring led part, this one with holder for cable management .