Door measurements

[Tortloverr]

I'm building a new enclosure for my baby Russian that will last him until he's full grown. I came across the picture below which is what I'm basing my new enclosure on, I just have one question: how wide and tall should the door be? How tall and wide do Russians normally get?

 

[Tidgy's Dad]

i would make the door slightly bigger than the tortoise and then enlarge it as he grows.