These would be my guesses:
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You get as many do-overs as it takes to finish the print. However given what I’ve seen of the GF interface if you don’t stop a print, or the interface doesn’t error, I imagine its considered complete and you would need to contact support to resolve.
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Test firing is likely not included, the point of the catalog is that the files have already been tested for you. If you use proofgrade, that goes double. If you use your own material all bets are off, both because you would be far better off testing that material with a test pattern, and because some designs are made for specific thicknesses of product. Cardboard is all over the map.
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Layers are normally broken down into separate files so as you finish one, per #1, it’s used.
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You pay the difference as far as I know.
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Nothing is locked, the layers are opened like normal art, you can add, scale, rotate etc.
/grain of salt for all answers