[Help] Making own CWM installable zip - can't be installed

Hi, I'm strugglint with making my custom installable zip, moved all updated content to it but CWM seems having problem with that (installation aborted).
Do I need customize the zip some way to be able installl?
I'm only updating content of data folders, na apps are installed:

/system/bin/
/system/etc/
/system/fonts/
/system/media/audio/alarms/
/system/media/audio/notifications/
/system/media/audio/ringtones/

Do I need to provide something like script to copy the content to it's place?
The zip folders structure exactly mirrors as it should be in phone root fs

Thanks for any advice!

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