Thats true but i am 6'2" and need to get in it to clean it so the height is important to me! i think shelves and ladders are a good idea though, maybe a bit of tree trunk and some old t shirts as hammocks too? Perhaps Tyla's kong dog toy too as she just ignores it!
I`m not trying to p**s on your bonfire because that`s a spot on job you`ve done, but if the ferrets can`t benefit from the height of the court then they just as well be in a large hutch. Shelves don`t have to be wide and ladders can be removable and they love drainpipes. Go on try it, if it doesn`t suit then you can always take