Maybe I am foolish to say this, but I am thinking that one could simply make the colour seperation negatives from regular black and white large format film? Of course, digital negative printing has its conveniences, but I presume there is nothing against going about it in the old fashioned way? As one might conclude, I am suggesting this since I am a bit of a dunce when it comes to using digital workstations.
Also, I am slightly curious about the albumen coating emulsion that was demonstrated in one of the videos. Albumen, water and bichromate of potash - how much of each is used to create the emulsion solution?