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The mini duna is too small for most hams I think, if you want a tank style cage then the duna multy is a much better option.
The savic mickey is almost exactly the same cage as the hamster heaven but with narrower bar spacing & without all the tubes & penthouse that you don't want anyway so it does make a good robo cage.
A lot of other barred cages tend to be to tall even if they do have narrow bar spacing so the Mickey is probably about the best barred option.