Thank you.
Those darker pieces are actually lead blocks from ICBM. Also I thought it made a bit of sense considering radiation levels in space, the only bad part about that is replicating that many lead blocks will be next to impossible, currently exploring alternatives to them, might have to settle on obsidian. And yes, those are daylight sensors filling in as solar panels. Still working on how to make solar arrays look better, they're currently too small in that screenshot, still exploring alternatives.
All airlock frame blocks used are strictly used in the airlocks themselves, with that meteoric ore requirement I'm anticipating that they will be difficult to produce en masse.
I fully agree, I believe horizontal airlocks have already been addressed by micdoodle8 and they will be implemented in the future.
I know what you mean. Mekanism does have solar panels, and interestingly enough Galacticraft is compatible with Mekanism, so much so to the point that solar panels on a space station yield 3x the amount of energy they do on earth. I would utilize this, but to be honest with you I don't really like most of the stuff in Mekanism, nor do I like the textures used for all the equipment, therefore I don't use it.
I promise I'll be getting more pics up soon, been very busy at work recently.