Wow what a superb device! Well done.
Makes my process seem somewhat jurasic lol but noetheless it works me.
By sharing it, maybe someone else will be able to obtain photos from some of the cameras they have that they believed would never be used!
Basically I use the changing bag to load/ unload film/plate holders.
The exposed sheet film is removed from the film holder and gently "folded" (not creased!) in half placing the top and bottom edges together...The film is held in this position with an elastic band.
It is imperative that the emulsion side of the film is on the inside!
The film is the placed in the tank (upto 4 will fit in a standard system 4 tank) with the central "spool" in place. If this "spool" is not in place then the tank will not be lightproof!!!!
The funnel lid is attached and then the developing process is carried out just as if developing roll film.
At the moment I only use 9x12 and quarter plate film but I am confident this process will work for larger formats if i use a larger tank!
I scan my negatives onto the computer then print just like any other digital photograph.
The limitations of the scanner means that should I develop larger formats then I will have to request the services of a photolab to have the images put onto paper...A small price to pay if it means I can obtain prints from some of my oldest cameras.
Like most photographers, I strive for a quality photograph as an end result, however with my vintage photography I receive an immense amount of pleasure simply from obtaining an image( regardless of quality) from cameras that are sometimes over 100 years old!