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im making a black mesa map for Natural selection (if you havent already guessed) with some stuff, its in early alpha stages at the moment, with the ready room complete with some of the marine side done. the link contains more details and screens.
UPDATE #2:
ive improved the grate area, ive added two blueshift style generators and a tram rail with cart for jetpackers and fades to sit in, ive also increased the hight of the area vastly, to accomodate for two large fans at the top, along with an actual cieling, the concrete textures are going to change too!

the marine spawn room is now not so box shaped, its got a curved roof with partially interesting lights,

the readyroom now has aligned textures! (not such a great thing to boast about, but it is done)