You do remember we're making this for a game.
With Dwarves
It's hardly a functional language, and if it were it would only be on paper. Nobody's gonna bother with pronunciation because nobody needs to pronounce anything. Any pronunciation of "Urist" is correct because it's not like people ever really say the word enough for a certain way to say it to exist.
If we were really serious about creating a real language and getting people to speak it, then we would go somewhere else. To take this seriously is OK, but to be serious about it is not, because none of us are. Heck, we all have different views of a perfect language, and none of us are trying to make this it. If I were to do all of this on my own, I would be starting in a completely different place (probably pronunciation). I'd be learning the language as I was trying to create it.
For the most part, all of my actual Russian comes out of textbooks (I don't think chatting with Russian people is good for actual grammar). If I were to create a language, I would write a textbook about how to speak it fluently. To say that we were doing anything of the sort here is bogus. I mean, we're only gonna have short phrases, maybe paragraphs, depicting stories and the like. I'd argue that anything that resembles a subjunctive mood is highly unnecessary, even if Dwarvish was exactly like Spanish, because anything more than "This is XYZ The ABC of 123, he has sharp claws and a big nose. Beware his orange snot, it is orange!" is not likely to show up.
TL;DR, we're not serious in a "this is an actual language" sense. It is going to be a language (we hope), and is going to have at least basic grammar, but it's never going to be spoken or written in great length. Anybody who writes at all will probably use a guide to writing in Dwarvish.