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as you can see here the K-on girls are bigger than the guppies.
ritsu has a torso joint under her dress where her panties are so if you took her apart there then you would have double dresses not to mention that and the next torso joint is under the breasts so if you took her apart there than she would look quite odd with the smaller bottom torso of the guppie.
psraonally i think ritsu sits just fine on the stool that she comes with and looks natural to me but i suppose to each his own