I found a collection of several models compiled into one package by user NightFright on QuakeOne forums. It doesn't include the new Shambler, since the pack was created last year, but does have player, grunt, rottweiler, knight and rotfish models, and also a knight statue thing for the Mission Pack with the knight statues. (I can't tell them apart anymore. Maybe I should replay them.)
http://quakeone.com/forums/quake-mod-releases/works-progress/9573-authentic-model-improvement-47.html#post157901
The package is at Quaketastic:
http://www.quaketastic.com/files/models/auth_mdl11.zip
The parent directory has something weird going on. It is
http://www.quaketastic.com/files/models/
and when I try to look at it, it just gives me a file whose entire contents are apparently this text:
TAh....Who dey waba
This isn't how other directories at Quaketastic work. It's a bit weird to say the least. And it does mean I cannot upload an updated version into that directory.
I couldn't locate any recent versions of Makaqu to have a look at its models.
I will add the new shambler model to this package and release the result in a similar format soon. I don't have an account on QuakeOne forums, but I could see that NightFright hasn't been active there for several months. So, it's easier to make my own version rather than try to contact him and ask for an update.
I'll just have to write a readme with appropriate credits, and I'll post an update here. I'll put a preliminary version up on my Dropbox and the nask you folks where I can upload it permanently, because of that thing with the Quaketastic models directory.
(Update probably tomorrow.)