There is no software that will let you simply open a Mobi file and edit it like Sigil does for ePubs. The only way to edit a Mobi file once it's made is to use something (mobi2html, mobi2oeb...) to bust it apart and then remake the Mobi file when you're done.
If you're having DTP problems with Mobi files generated from ePub you might try Mobipocket Desktop reader or KindleGen to make your Mobi file instead.
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