I found a way through the jungle. It is not as easy as it seems. It's not like this, because I take some stylings with me like some modules eg. scroller and cart. And the new template still contains some elements from your styles.
But i did it now. I figured out how to do this and both are playin very (!) well together.
So i have to say that one reason ist surely, that your templates and styles are well coded. It was not as difficult for me as it seemed at first.
Thank you very much! Everything seems to work fine.