Gus, it is a start. I like your comments on the economics.
You missed the way I've hung a number of lenses in front of a shutter. They go into cup-shaped adapters that screw into the front of a standard shutter. Price of the adapter from SKGrimes depends on size. If sharing an adapter between several lenses isn't possible the economics are usually terrible.
About mounting a lens on a board and attaching a shutter in front of the lens. I did this with a Compound #5 and a 900/10 Apo-Saphir. The shutter isn't strong enough to support the lens and anyway if the shutter were in front of the lens the shutter controls would be inaccessible. Big fat lenses need special treatment.
Packards and the various Sinar shutters aren't the only behind-the-lens shutters around. There's a variety of roller blind shutters -- Thornton-Pickard is probably the best-known brand -- and there are also Mentor shutters. Last summer I saw a 16x20 camera with a shutter taken from, IIRC, a Mentor Studio. Its owner remarked that demand for shutters for ULF cameras was driving up the price of Mentor Studios. Surgery on a Speed Graphic is also possible.
And because you didn't go far into front-mounting you didn't mention vignetting. This can be a problem, should always be thought about.
See my lens diary
http://www.galerie-photo.com/telecha...2011-03-29.pdf and my account of my failed Baby Bertha
http://www.galerie-photo.com/baby-bertha-6x9-en.html for better explanations and discussion. See especially what I had done to make a short lens usable.
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