I had an imac fantasy a few years ago for my previous syrian Tilly.
She was an absolute nightmare in it. She used to hoard all her food on the top layer and then wee on it all so I used to have to clean that level of the cage most days to stop it smelling.
She also took to chewing the clips which hold the tunnels in place - so much so that the tunnels fell a couple of times during the night. I ended up buying her a new cage without the tunnels and her chewing stopped overnight and she turned into spiderwomen and used to climb laps round the roof of the cage ha ha!
Thinking about it - perhaps she was the pain, not the imac fantasy, she was a beautiful, feisty girl that knew how to keep herself amused