If you're building a completely custom case, you can design your own bezel too maybe?
http://www.amazon.com/StarTech-BEZELWRKIT-Case-Front-Bezel/dp/B00213KDQK
Wow. Thanks, dave. I didn't know they actually sold kits like that, or that Startech made them.
The LEDs and wire can be replaced from scratch -- materials you can find at the local electronics "warehouse" or "jobber" outlet. In our town, such a place is located right next door to a metals supplier. At the metals supplier, you can buy tools such as tap-and-die kits, airplane shears, drills and bits and other more common items. You can also get aluminum or steel bars in various widths, lengths and thicknesses (see the supports for the 3.5" double-casters in the project pictures below); "perf"-steel and perf-aluminum -- commonly called "modders' mesh;" and of course sheet-steel and sheet-aluminum without the "perf".
Other places online also offer an even wider assortment of LEDs.
Here's the time-consuming project I could just as easily bury from sight, but it was a great success -- actually:
Before:
http://webpages.charter.net/psywar_sentinel/Proliant_exterior.jpg
After:
http://webpages.charter.net/psywar_sentinel/Preview%20Glimpse.jpg
http://webpages.charter.net/psywar_sentinel/chrome window.jpg
I simply used the LEDs of the original ProLiant case, but added my own red LEDs for each of the four RAID5 HDDs -- offering a nice "piano-key" effect when the drives were working.
You can always buy wire-rolls of the right gauge to replace the usual case-to-motherboard wiring. And you can buy custom switches: In the ProLiant project, I used a chrome "airplane" toggle switch I'd bought at MNPC Tech:
http://mnpctech.com/
together with the heavy-duty aluminum case-top handles.
But you can always find a ten-year-old case-discard -- maybe at the recycler's -- which has the old wiring and LEDs. Seldom would you have any of those parts die, but LEDs are easily replaced, and even the switches.
With the 2007 ProLiant project, somebody gave me an IBM midtower case from an old Win 98 system. It had a clever removable power supply cage which just unlocked and popped out of the case. So I cut out the essential pieces of it, and installed it in the ProLiant.