New unit creation

I am curious about this too. Changing stuff is neat and all, but my favourite mods are the ones that add stuff. Though I had read somewhere that someone was trying to make a spider-unit in the vein of the Monkeylord from Supreme Commander.

TAG Utter, Lone_Ninja or Luxlupus could point you in the right direction.

You can make new units pretty easily using existing models but I'm guessing you mean new models, right?

We have some modders working on importing new models, but their process is not an easy one. Once we get proper tools for importing assets and more robust modding support we will publically release documentation for it. With many other things such as our Map Editor, we are waiting until they are much more user friendly and robust before we are pushing it publically. 

I tried looking through the forums, but is there an idiot's guide to this for people like me? I've seen the "modding guide", but it doesn't exactly go over how to assign weapons, or how to put them in the build menu, or stuff like that.

Oh yeah, our modding and map making guide isn't too good at the moment and could certainly do with some love. Ultimately since our modding capabilities and tools (or lack thereof) is still very much a work in progress, we haven't yet been too focused on getting all the documentation up for it. It's something I can write up when I get a chance.

Oh, that'd be fantastic, yes please!

There's also some more modding functionality to be added into 2.4 which currently isn't available. 

Can mods only be played with the -modding launch option? I'd rather play with mods in DX12.

I might be able to answer some basic modding questions too if somebody has any.