It's good to see a lot of work being poured into the pre production of your project!
I would advise your team to start pressing on into working your prototype/proof of concept into a playable build, or at least a vertical slice, for the upcoming playtest.
I wish we had a little bit more time for pre production, but it seems we're being thrust right into the playtesting aspect of this project, meaning we need concrete builds of some kind.
I wish you and your team luck on your project, and I believe your work on setting up future plans will pay off for you.