Thanks for your feedback!
The sky will get fixed.
It's kinda messy in my quake3 folders, so something always goes wrong when making my pk3s...
Even when using Mapacker
* Either clip off areas on top of the blinking lights or texture the caulked bits, I can see the void. You also over-aggressively caulked other areas that you can rocket jump up to. Either clip or texture.
Hey ! I forgot to ask about that point

It's good that you mention it. I'll most likely go with the texturing instead of clipping.
Btw, what textures are those, looking for similar textures for a map I'm doing as I'm writing this...
Most of the textures are from MrClean's Texture Set 4 (
http://mrclean.planetquake.gamespy.com/2dart.shtml)
and some additional by Rorshach.
I think that you can come up with a better color theme then having all lights white. Other that that it looks good.
I thought about having these white lights more yellowish, but that could be too much of warm colors. Colder colors don't really fit the theme, so i sticked to white. But i'll do some testing.