Help For Making Stock rom as custom rom

HOW CAN I MAKE MY DEVICE STOCK ROM INTO CUSTOM ROM.
I JUST USED CYGWIN AND EXTRACTED MY STOCK ROM WITH IT.
AFTER THAT I CREATED ITS ZIP FILE SO THAT I CAN INSTALL IT VIA CUSTOM RECOVERY.
BUT ITS GIVING STATUS 7 ERROR.

PLZ TELL ME WHAT Am i DOING WRONG!

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