It wasn't clear from your post that you meant /battery/ cases. What's the problem with the cases on the market that make them unacceptable? I haven't tried the

It wasn't clear from your post that you meant /battery/ cases. What's the problem with the cases on the market that make them unacceptable? I haven't tried the one I linked to but it looks good, seems to be well designed, and is around the total thickness you're aiming fora