Its via the video mode, no shutter actuation's. Magic lantern has enabled raw on the video side of things. A updated version of this:
http://blog.iso50.com/23724/convert-8mm-with-5d-mark-ii/
You could do it yourself with magic lantern and a 5d mark III/projector. Raw format, custom frame rate.
http://fiskephotography.smugmug.com/photos/i-4GwwTvk/0/L/i-4GwwTvk-L.jpg
Is c-mount a dead format (any new c-mount lenses being produced these days)? Could the m43 mount be a more suitable mount? SLR Magic makes some great glass for that system and its evolving. Don't know how much the licensing cost are though.