Its a hell of a lot better than the trivia schlock most theaters are made to show. Also a lot of the Press/ Promotion kits come with slides pre-made that don't have "Pepsi" or "The Joy of Smacka-cola" printed on them.

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Mounting frames from old trailers is a good idea, but the frames will be less than half the size of a standard 35mm slide. So you will have to use the "half frame" slide mounts. I've often mounted 35mm print frames in a standard slide mount so you see the entire film: picture, soundtracks, and perforations --- doing this for the preshow slides would let the audience see what's really on a print, and add interest to the pre-show.

Dustin is correct about the focus difference. Camera original slides are exposed with the film emulsion toward the camera lens, so they are shown with the film emulsion toward the projector lens. Motion picture prints are contact printed from a negative, so they always have the emulsion side facing away from the projector lens. Mixing the two orientations confuses the auto focusing of the slide projector.

Clips should NEVER be taken from a feature.