Sorry for this late answer. I had no internet access for some days.
Big thanks for your help! I installed all the plugins and programs (modify epub, Sigil, Mobi Unpack) and got a very good epub now.
If you are still interested in the mobi and it is ok for the forum policy of posting ebooks I will post it here.
Thanks again!
I found some nice plugins and learned much about Calibre.
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