If i am lucky i can be at at FabLab today. So i will try the arcyl. I think you are right, i should try both and look wats looking better. The arcryl is not too expensive, so i'll try it first. If it fits with LEDs or not... also i have to see. I'll post some pictures. I thought to put 1 RGB LED in every corner and than controll it with the Arduino. So i could display some values like temperature, or humidity with colors.... hopefully i can post the first laser cut this evening. Thank you for your ideas and interest !

acrylics aren't that pricey, so I would try to consider both. I don't like acrylics and LEDs though, it's kind of 1990s stuff and this project should aim 1890s stuff ;)

etched glass! ;)

oh yeah, how far are you on that? :) etched glass could work for the engravings, one would need some cutted stickers that are etchant resistent? But the holes?

heh, I actually re-thought my posting that after I realized that a laser would probably have a hard time etching glass... But, you're onto something with the laser-cut-sticker-sheeting as an etch-resist. Holes: dremmel+diamond-bit? edge-lighting... (well, I have no idea how well edge-lit etched-glass works, my attempts have been less-than-satisfactory). Shall we adopt this project as our own? ;p