That last comment makes me feel sad. I myself love film projectors and watching a movie in 3-strip Cinerama and 70mm film are my only remaining assignments to complete my Cinematic experience.
By 3-strip Cinerama, do you mean the original 3 camera setup? Does that exist anywhere?
I once read there are still a few of those the States and some European countries, and for some reason the one I remember best is one in Seattle which yes, is the original 3-projector setup.
Also the National Media Museum in Bradford, UK.