"Fortunately" the HVAC EL sheet should be much easier to make out of a 'universal' sheet since it's just a rectangle with some holes punched in it.. Unfortunately, because the original EL only lights up those segments that you see lit, the OEM driver for it on the circuit board is vastly undersized for a rectangle EL that big. I have one of the HVAC overlays, I'm going to get a photo of it installed this weekend as well to see what it looks like with the original EL sheet.
2005 Chrome Orange Elise
Mod list: Stainless shift knob.