There is already a Minevast parkour. I recommend doing something unique but vast, that way the parkour doesnt feel repeated. Rather than having a direct theme, try a general theme. For example (kind of a garbage example) : Office Supplies. Rather than having Staplers or paper or whatever. That way, you can not only have more to build, but generally, building other objects/places in a parkour drastically makes it better. Height and depth are important in parkour courses, but it's how you access the heights and depths are even more important. Good luck!