Well done Imrahil, thats a very welcome and refreshing new take on a custom. I really love it.
You can get clear blu ray cases aswell.
As for the text on the back, you reach the same hurdle as i always get to. But i think in this case you could even get away with any sort of synopsis for the back.
Spines, i love to place an image across a set to make a spanning spine set as it stands out on a shelf (but thats my thing).
Looking forward to see the completed cover(s).