I'm a huge fan of horror memorabilia and you have a WONDERFUL collection. Keep on collecting!
If you don't mind, I'll offer you some advice - personally, I would not cover them in cases. Pieces like yours display so much better out in the open. I know dust is public enemy number one to all collectors but if your diligent with maintenance you really have very little to worry about.
Again, fantastic collection and I look forward to future updates!