I want to project my 4x5 inch film to sizes of about 8-12 feet. I have lenses already, although I'm not sure if they will be suitable for this purpose. I have a Schneider Xenotar 135mm f/3.5 lens, which has a resolution of about 15 lines/mm at f/3.5, and of about 45 lines/mm at f/8 (this was measured on Kodak 4x5 inch film.

If I can use my Schneider Xenotar 135/3.5, that would be great. However, I read that projector lenses need to have a very very flat field, as they're projecting into a flat screen. Will this be suitable? Also, if projected wide open at f/3.5, will that limit the resolution of the final projection on the screen to equivalent to 15 lines/mm (i.e., 15 lines/mm = 15 lines/mm * 25.4 mm/in * 5 in = 1905 lines horizontally)? I want to enlarge slides while preserving all of the detail that is on them.

Can I use the Schneider Xenotar 135/3.5 and project in reverse through my large-format monorail? This would require me making the slide-holder part of the projector, light source, fresnel, and mirror as something that is light enough to clip into the back of the LF 4x5 monorail, via an interface like the lens-boards.

My primary concerns are:

(1) Low heat production, so that my 4x5 transparencies are not ruined. Is LED backlighting with a fresnel viable yet?
(2) Preserve as much detail as possible from my slides when projecting
(3) If I can use my Schneider Xenotar 135/3.5, a setup that reverse projects through my camera would be great, as I don't want to have to unmount my lens from its lens-board.