Picked up a Polaroid half-tone line screen (85 lines per inch) on eBay recently. It's made for some Polaroid camera, but it's 4x5" and should work well for that format as well.
The trick will be mounting it and adjusting the spacing.
However, what does anyone know about making analog half-tones? Like approximately how far from the film should the screen go? My limited understanding is that distance from the film and the f-stop allows for control over the half-toning.
Does anyone know of old trade publications, or instructional pamphlets for making half-tones? Surely there's a lot, this just isn't a field of research I've really looked into.