This game is about you, escaping as a scientist from Black Mesa Headquarter, A new building build in 1956. This building we're used to hold some public project. Before you joined as a scientist, you need to do a training on a Hazard Course. The Black Mesa Headquarter is much the same as Black Mesa Research Facility itself.
Beautiful
Solid design! I'd eventually improve upon the Pyramid where the Black Mesa Logo rotates on.. Possibly add some cable or other black structure indicating that some sort of electronics and engine are attached inside that pyramid or how about a monitor and keyboard attached to any fitting side. On the ceiling eventually some Cameras, Loud Speakers for announcements or water sprinklers or perhaps inactive rotating alert lights.
Twhl.info
Just for additional eye candy and to enhance the ceiling further. Onto the corridor itself I'd add some of the typical Black Mesa carts with some equipment sitting on top. Or a wishing cart with mop and a puddle of water.