The map within the b42chunkcleaner tool serves purely as a reference. The accuracy of the chunk representation varies, being nearly or more precise depending on the specific context. You can experiment with different zoom levels; in this particular case, I utilized a 50% zoom (selectable in the upper right corner). I haven't yet had the opportunity to focus on that specific tool, but its entire codebase is available on GitHub should you wish to create a branch and suggest modifications. Prior to deletion, it's always advisable to capture a screenshot of the elements you intend to remove for confirmation. Check this Example[imgur.com]