Can confirm this works with Merciless Mod but ammo scarcity will be an issue. I was able to scrape by by avoiding killing some glitched enemies: https://youtu.be/mOcepfzKnaw

Pretty good effort, though I personally didn't feel like I was in Black Mesa. Still fun to play and fairly challenging.

As it says in the description, it was actually a very small map. But it was kind of fun to use trip mine to kill the zombies. The interesting thing was this map gave almost exact amount of ammo to finish. When I finished it, I had only one shotgun shell remained.

this is pretty cool