Now we're back (i hope)
So, after my motherboard decided to die, HDD followed along. Shame, but it allowed for unprecedented opportunity to install linux mint. And i kinda like it already, despite just having it for a day, it's very easy to adapt.
Oh, and i love VALVE, unironically, they're so cool for having Proton free. Any other company would hide it behind a paywall, or subscription which would be even worse, but valvechads just tossed it out there, saying - "go ahead, boys, enjoy".
Now with that out of the way
DIsplacement model
What is this? It's a flat plane with a lot of bones that you can manipulate via any tool that allows bone manipulation. Ragdoll Mover for example, which is used in screenshot.
With that you can do pretty much any terrain you want, walls too (like caves). My personal recommendation is to use it with ragdoll mover and advanced material tool (so you could place any texture you want on it and manipulate said texture), also toss some scaling tools for good measure, they would come handy.
I'm still adjusting to linux though, so it might take a while considering studiomdl, which is compiler for source models, seems to be windows native. But hammer seems to work fine so far, at least you know, it launches and you can work in it, yet to see how it'll act in compilation but it's problems of my future self.
garry's mod
gmod