I was going for harsh industrial on the lighting, but I can look at toning it down.

Not sure what you mean about the textures. Every texture is rusty, except for the bricks. I will look at the lunaran textures. Are they not included in the defaults?

Gameplay ok?

Yeah, lunaran is in the default texture set. Look at the floor in metl4, that texture would suit this map well imo. Try having a bit more shadowing in play there too, the lightvalue is to uniform across most of the structure, making it a little bland. You may even consider adding in lamps and making this night-themed.

I'll generate some waypoints and playtest the map when it doesn't burn my eyes :P

I think I tried that texture, but it felt too shiny:) I used it on the big pipe.

That texture you talk about is a floor texture, use it on the floor or not at all.

You have ground textures on the walls, trim textures on walls and floors. That´s not the way to use them.

That floor texture on the wall is especially out of place, try to mason a wall like that, it will tumble down before you finished it.

Every texture has it´s purpose, and mostly only works well when used acccording to it.

Ok, but unless I'm missing something, the textures don't have descriptions or categories to help in selecting them.

Now you have a bit more depth to your map, you didn't need to make it night though, 'twas a random suggestion :)

Next, I'd suggest fixing the texturing and detailing, it still looks a little messy.