I was hoping you would add to this discussion.
I would like to add that someday, as I mentioned in another post here, matrix film may be unobtainable except by making and coating using methods you have published. This is a real possibility as the market for everything decreases.
Jim's flat bed coater makes excellent 30x40 sheets of film and may be one of the few routes to large sheets of film or paper that is coated in small shops. He has published the plans on his web site.
In fact, I would like to mention that Jim's Matrix emulsion formula will be in my book with Jim's kind permission and for which I thank him here in advance. Thanks Jim!