It seems like you did a really good job on those shelves, looks great!! I would take the wheel out and the plastic ball also in the meantime, just in case. Since you're chin spin and hammock are on their way a week or so won't be so bad for your chin to miss running on a wheel or having another place to hop to.
Removing the wheel won't make him angry just give him a few extra minutes of out of cage exercise and he should be fine.
Looks to me like a really fun place to live. What is the purple plastic thing?
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