The devs have their own set of tools and some informal documentation at the least of how to use them. We're not asking anyone to try to bend over backwards to make the game moddable. Just maybe some of the tools that the devs used themselves.
Actually, like T7Nowhere mentioned -- if nothing else -- just a simple freaking .mdl compiler/decompiler. Throw us a bone, documentation, something.
We'll make the rest of the tools ourselves if we have to -- and we have.