WWI: Source models for Garry's Mod

Other than directly trying to dump everything into Garrysmod/Garrysmod, how else would I be able to get the models from WWI: Source into GMod?

http://www.ww1-source.com/

The mod is fairly dead, but I’m quite the WWI enthusiast, so I was hoping that there would be some way to use the stuff from this game. If anyone has any suggestions, or wants to undertake the task themselves, a workshop could be nice, even.

Anyway, thank you for your time.

I think someone made some models that were based off WWI stuff.
Fairly similar to WWI uniforms and stuff.

This :