Arghh... Bellows

I tried to work out some of the details on a new layout drawing of the bellows on my camera project, but I’m feeling pretty frustrated. Because the bellows are tapered, there has to be an adjustment to the angles of the folds, I’m having a horrible time trying to figure out how to draw them correctly. I have two sources as a guide, a reprint of an early 20th-century period book on constructing your own camera and an Internet source on making bellows. Although these two sources help, there seems to be critical information missing that frustrates me to no end. I’m afraid that I’m starting to think that this project is just too ambitious for my time here and I may have to bag it and move on to others. I could really use an engineer at times.