This was a good time. Ten single-player maps based on the original game's deathmatch layouts (plus a couple of bonuses, like Q2DM1). I love trying to recontextualise levels like this—I did it myself on de_nocredit—and the author knocked these ones out of the park.
Their faithfulness to the original layouts is... loose, at best (barely recognisable in parts, even) but the results are extremely high-quality, with some of the best use of id and id-style textures I've seen.