There ar eno formal docs yet, so simply just give it a try. It will show you the root folder of an empty epub. You will be able to select it, and add subfolders to it, and add marker files to specific folders to tell Sigil wheere you want files of a specific type to go.
If you try to save it for use, it will run a test to make sure your design is sane.
Give it a try. Then take a few moments to write-up a how-to to help us out.
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