Do have a cage sorted and thinking about layouts? I think you had a detolf before didn't you? Can't go wrong with that. I'm not very good at planning layouts. I start out with an idea, then find some things don't work, or don't fit, then it sort of evolves. But there are some really good layouts out there! Some of it depends on your hamster's personality a bit. Some are bolder and don't mind a fair bit of open space above - some feel more confident being "under" something when out and about. Which is why I like rat sputniks