The Packard is slimmer than the TP, and mounts by being screwed onto a piece of wood from the back - usually behind the lens, but there is nothing that would say you couldn't mont the entire assembly then in front of the lens. If the shutter is only a short distance behind the lens and the opening is larger than the back element, I don't see a problem. Stopped down would be less of a problem, not more, since the actual opening through which your image is projected on the film is then much smaller than the 110mm wide element. You don't say what "being mounted a little further away from the element itself" actually entails, however so there might be a problem if you have it set back far enough...