This one is actually better I think:
https://kawaya.com/iep-norimaki-gmn.html
I realised looking at that, that it doesn't show whether it has a window for the external camera?
Assuming they are all the same, it doesn't (I do NOT speak, or read, any Japanese, so I don't really know what the page says, but at least on a few of the pictures you can see that it has a "solid" back...). But it should be possible to cut it out yourself, but then we are closing in on "you could make the hole case yourself...".
