So, first of all, you had "Old West" "Post-Apocalypse" and "Dinosaurs" in the title. I would play crap out of that setting! That is like what 10-year-old Sandy wished the world was. It's the perfect world.

Now adult Sandy wants to know about the mechanics. Would you be changing speeds stats and stuff to reflect that it's Dinosaurs? Would there be Chernobyl style hazard areas from the cataclysm? Can I lasso a T-Rex if I have a +5 strength modifier? Can one of the quests be a Triceratops cattle drive? And now we are back to ten-year-old Sandy. This sounds awesome and I want to play in this sandbox!