One of the problems is that DAZ has given its own PA's very little guidance on library structure, even when specifically asked to do so. For Poser formatted content, we continue to use Poser rules, but for DAZ|Studio native files, it's a free for all. My first product was just released with a D|S specific set of files, and I followed the format that was used for the base content that comes with the D|S download. I think that DAZ assumes that it doesn't matter, as most users will eventually move files around to suit themselves, and there are no "rules" about where a specific library file can go, as there has been with Poser. As long as you leave the Runtime folder and its contents alone, you can rearrange the Contents subfolders and files to your hearts content, and D|S will still load the content.