Just found this thread and thought I'd pipe in. I just hacked a flat panel like in this discussion on CloudyNights: www.cloudynights.com/topic/536533-diy-alnitak-flat-panel
Electronically it's pretty simple. You just have to peel back the plastic cover on the back panel of the EL panel (I got
for my 8" SCT but I think I'll need to get a
www.amazon.ca/gp/product/B00ZDCALAE larger one
for my new 10" ). I connected the wires as per this schematic:
I loaded the sketch from github.com/jwellman80/ArduinoLightbox and it works like a charm, I can turn on the EL panel from INDI control panel. I'd give it a go Peter!