People are way over thinking/engineering this idea.
Use spaghetti container. or any appropriate storage container, flipped upside down. Cut hole and use silicone caulk to adhere a piece of glass or cheap tempered glass phone screen protector to seal lens cutout.
I can’t comment on the asthetics, but that part, along with how to secure the camera in the spaghetti box. I’ll leave up to you
(sorry, couldn’t get full pic to post)