Even without a .gcf file, it isn’t hard to get any of the content. I’m not saying I would do it other than to make a map, but I wouldn’t see why the Devs would want to keep the possibilities of Black Mesa limited. Even if they did, if you are going to install the game on your hard drive, you have everything you need to make a mod. If you don’t think you can, wait for some people to create extractors or a user-made SDK, like the one that some people made for Left 4 Dead. Plus, the sounds and models would be the easiest thing in the world to get, all you need to do is look in the directory where it’s installed and look for the right folders. Even if they’re in .pak’s or any other type of file like that, there’s so many extractors out there. Anyway, to the one dude who signed up just to say that I was retarded for saying Black Mesa RP, if you like to RP on Garrysmod, and you love Half-Life, how sweet would it be to combine the two with high-res models and Source maps? Anyway, to the people who were talking about Gargs versing Striders, this is possible in Garrysmod as it is. A scripter made a Half-Life mod for garrysmod, which includes most weapons from Half-Life, and almost every NPC from half-life, as well as some NPC’s from Opposing Force and Blue Shift. Just look up Half-Life Renaissance on garrysmod.com (No, no Resonance, Renaissance, they aren’t talking about the Resonance Cascade). The pack uses the high-detail models.
They also added a gamemode right in with it, which lets you play the entire Half-Life Campaign, if you have Half-Life Source, and I think you need Half-Life Source to run the addon. The campaign is glitchy, but fun to play with other people, and just playing on Sandbox on the maps and making random stuff happen is fun. The campaign is a bit glitchy in parts, and the creator didn’t add turrets to the addon, so no Military turrets, also, some things are a bit glitchy, like scientists in certain places being colored all black, or invisible lifts, just take out your toolgun and remove any coloring from these things and it’ll be fine.