I'm inexperienced with lua but I've got extensive experience working with models, materials, and maps for the source engine, centralized around level design and environmental art.

I've been playing this gamemode- which in its current state has some broken components on up-to-date garry'smod -with a friend and had to dig up some web archive facepunch pages as well as decompile some of the included maps in order to build some new environments to play on.

Would love to get in contact with you (and if possible some of the other devs?) to bring this gamemode back to life. I would be happy to volunteer maps (which I am already currently making just for fun, we've really being enjoying the gamemode), and any models/materials on request as needed.

I know this gamemode in its current state was done a long time ago, and I'm sure you've long since moved on with your life by now, but if you're remotely interested and would like to volunteer some time to this, I think it would be a noble endeavor to bring this gamemode back to modern garry'smod!

If you come back, see this post, and you're interested at all, get ahold of me! We can work out how and when is best to combine efforts. We can make Onslaught Evolved 2.0 for Gmod 13 a reality!