The procedure is described here
but he doesn’t appear to have posted the final result that I can see. Your svgs posted as svgs (the forum has gotten better with svgs.) They can be downloaded by right clicking on them. I’ll have a look and point out problems and create a part.
edit: Here is a part created from your svg. If you unzip the .fzpz file you will get the.fzp file and the three svgs which you can then look over to see what a correct part should look like. This part has been run through FritzingCheckPart.py (available in the tutorial listed above) to clean up various things Fritzing doesn’t like about Inkscape (or most any svg editor.) You should do the same if you make changes.
6xAA-battery.fzpz (13.8 KB)
Feel free to ask about anything you don’t understand.I’m always happy to help people make parts.
Peter