I don't think you can get a 90F basking spot in a 36 inch cage without raising the heat in the entire cage past what is good for a crestie... nor without lowering the humidity to the point that it will be unhealthy for the crestie. Especially not with it only 18 x 24in for the other dimensions. It's too small to get both ends of that co-mingled ranges needed.
I don't think an adult pink-tongue is a good match with an adult crestie and I think you'll end up with injured crestie, which you probably won't ever post about on here... which is why you probably don't read many "failed" cohab projects.
There's nothing really to "learn" in this as a capstone project imo. The animals don't come from anywhere near each other. There's zero "natural" interaction possible. It reads a lot more like someone who wants some pets, doesn't want to make two cages and thinks they can just smush the two into a cage and hey, I'll use my assignment as an excuse to do so.
I'm also unsure why you keep mentioning breeding, since you won't be breeding these.
