What's the foam board for? I think I found your cases online for like $3, and felt east easy enough. Just trying to figure out where the foam board plays in...if I were to totally copy your idea...
It made a pad underneath the felt. The felt I had was really thin, but the foam is certainly not necessary!
That is different . . . I ll have to look into that along with a few craft store(s) around town for something similar