Just thought it looked better. :P

it can always be shifted to carmored concrete but it wil mess up the textures and you have something against automated doors thats why you put mostly shutter doors?

Hey, I don't know if you are aware of the civilian structure thread Hummel posted on Emperion website. I just wanted to see if you wanted to share your creations with the dev team to add to the game. They would look really cool in modular cities. Anyways here is the link:
http://empyriononline.com/threads/challenge-civilian-buildings.8053/page-9#post-85258

I hope you join the rest of us builders taking Empyrion to the next level!