The instructions in the readme are pretty good to help guide you through all the edits needed to create the extra tab.. It was what I used as a guide to add the Defined page tabs that are a part of the current version..
Once you have your additional product fields working you will need to add the code needed so that your new tab will display your additional product fields.. This part is a tad over my head, but it sounds like there are community members who've chimed in here who can help you with that last part..
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