I was
so disappointed when I clicked on this thread and found a link to MVS cart shells, instead of affordable cart cases.

I don't like the idea of taking apart original games to create franken-carts, but if it can be done without damaging the originals, then I guess it would be alright... as long as they are also producing professional quality labels for every game.
But my nice-looking CMVS only shows the top of a cart, so these would be functionally useless.