UPDATE: New Lewis model! (and a couple other things at the bottom, idk I forgor)
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Transforms L4D2 into a Halo flood-themed game. (Functionally finished!)
The idea with this was to imagine an alternate timeline where the UNSC lost and a flood-infested High Charity took over Earth. Pretty much all that remains is the flood, a couple groups of ODSTs/Marines, and a stupid amount of weapons and ammunition.

Also includes a test map and 3 (technically 7, the first is a pack of 5) menu backgrounds. "Subscribe to all" works fine as the backgrounds have to be installed manually from their respective descriptions anyway. Feel free to pick and choose which ones you like. For easier access, here's the links to all 3:
Menu Overhaul - https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=808718080
Infested - https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1573772074
Winter Wonderland - https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1627503886

There's a font in here (by yours truly), and that has to be manually installed too: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2823922526
Like the background, it's entirely optional and doesn't affect any of the gameplay. Plus, fonts are a pain in the ass. It looks nice though.

Final link, here's a collection I made that has a few workshop items that I think are essential, even in vanilla games: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2824128317

Some weapons don't have proper icons (as well as one of the main menu icons, annoying, I know), but I got most of them. I may also make some icons in the future to fully complete the pack, but probably not.

While a lot of the music was replaced, I kept most of the infected nearby music (officially called "bacteria," bit of trivia for ya there) as they serve a mechanical purpose and I think should remain easily recognizable. The Tank and Witch themes, however, were still changed.

My biggest gripe with this mod pack is that all of the flood combat forms are UNSC. One of these days when I can figure out how to mod this stupid game, I'll make some citizen models. Unless someone else does it. Also, with the music addon, I don't really like the added concert music. Personally, I just remove that part of the file (in pack 1), move it directly to the addons folder, and disable the original. To edit .vpk files by the way, you need to either use Crowbar or GCFScape.

Also, these are the cross-hair settings I use. You don't have to use them, I just like it:
cl_crosshair_blue 163; cl_crosshair_red 238; cl_crosshair_green 212; cl_crosshair_alpha 255; cl_crosshair_dynamic 1; cl_crosshair_thickness 3