Model replacement mods for Alyx won't work in CM unfortunately.
It's a side effect of the per-encounter skin method used by the game.
Alyx can look one way when you first meet her, then completely different once you see her later, etc.
You CAN work around it, but it's a tedious and depending on your model, memory intensive process.
Texture mods that use default HL2's Alyx model will work however.
The above only applies to new models.
mbramblet
joined
A Roblox developer, Source Engine modder and HL2 Cinematic Mod wizard, living in God's image and who's always happy to help! If you have CM /Source problems, let me know and I'll help you out as best I can.