Just found out about this today. Dark Interval is basically an hl2 mod that's been in-progress for a while now, and its goal is to recreate scenes from the HL2 leaked beta and make it into a full game
It isn't perfect of course, but the maps look really fucking good.
Some screenshots:




Download it here: http://www.moddb.com/mods/dark-interval/downloads/dark-interval-part-i
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