Ok so, I have made furhter investigation, As I said, no female model in the model browser...
http://i.imgur.com/Jz99wP6.png
But in fact, they are here and at the right spot when I check directly into the folder http://i.imgur.com/CPGdShB.png but not visible in the model browser of SFM.

I first througth it was a compilling error in the QC (wrong compiling location) so I decompiled the model in order to give check... nothing wrong.
This case is a mystery, but anyways, I have already imported the one from Gmod, so not a big deal for me.

Lol wait I think I found what was the issue, since I have already ported this model into my usermod folder, I'm not sure but I think it's overwrite the search result from the workshop folder (since both model share the same name and that the usermod folder have a higher priority on the workshop folder).

might be.

Is there a compatible rig script?

not yet. but your welcome to make one.

can there be OG halo CE or 2 Marines pls cuz I found them cool :)

I don't know what's happening but basically some of the materials are bright white.

https://steamcommunity.com/sharedfiles/filedetails/?id=3458921975
https://steamcommunity.com/sharedfiles/filedetails/?id=3458922562

Probably something with the vmt's but I don't know specifically.

If I had to guess is that time has pretty much destroyed what was ported over. If possible, you could find these on GMod and use the gmad extraction tool built in and just toss them over into your SFM usermod folder.

I haven't messed with SFM fully in years, so I have no clue what else to really do here.