Well it looks quite good to me - but I would think that you have to have the actual cage that it goes with to attach it - or at least a cage of the exact same dimensions. Otherwise how would it fit/attach on?
The other thing to think about is that levels don't necessarily increase the floor space available to the hamster by that much and extra floor space is what they benefit from the most. Also high levels can be dangerous if your hamster can fall the full height of the cage.
I'm not sure what type of cage you have but could you not add another cage or bin to it via tubes (if your hamster will fit them) to give him a lot more space?
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