I'l rewrite what I had in the comments section since it was a bit vague and had some misinfo in it :S

It's a pretty nice port and but it suffers from the same problems the original hat kid port had when GFB released the beta models. Namely, the eyes disappear if exposed to any bright light.
https://i.imgur.com/00FpXlf.png

This isn't that hard to fix and can be done by anyone using the model- if you add "$alphatest" 1 (INCLUDING quotation marks) to each expression and eye VMT and reload the materials it should appear under light once more.
https://i.imgur.com/h9Qy4wd.png
https://i.imgur.com/ZM1ngqX.png

There is a new issue though that wasnt prevelent in the beta port (mostly because they forgot to include a normal map) and thats AO doesn't work properly. In fact, if you tick "show ambient occlusion" hat kid will vanish! Oh no!
https://i.imgur.com/OP4JnK0.png
https://i.imgur.com/aJZ42u3.png

I'm no expert but I think this is because of how the model handles expressions via alphas and all that lovely stuff. Adding $mostlyopaque to the models QC before compiling is often a quick and easy fix for any model suffering from this issue.

Again, its a mice port but theres some pointers to make it even better :D