I can't think of much to write this week, so I thought maybe I'll just air a work in progress and having it out in the open will help me thing better. In any case, my intent is to make a setting where fighting dinosaurs feels right, with a measure of cinematicness but not too much. The feeling I get when looking at the RAW in the Basic Set, and only that, a T-Rex is just a big bag of hit points that can be dropped in a few hits to the (thanks to SM difference) easily targeted skull. So I need to borrow rules from here and there to make it actually into a meaningfully different challenge when fighting against things several times one's own size that is bigger than "more HP and damage."
In any case, to manage expectations, my own, and potential players, I turn to the tool of building templates. They spell out what I think is important to know and communicate my expectations of what kind of adventures a player will have. This is an early, brittle, and inflexible draft, but coloring in the lines once, even if crudely, gives me a place to hang my hat and try to build up.