Bock's site is effectively onlya trade site - all it is there for is to show people an overview of what they produce, not necessarily the ins and outs of each product. They don't deal with the public on a retail basis
I have all that kind of gen here, and if there is something I don't have or don't know, I can ask them. If you ask them, they will generally refer you to me. It's a good, tried and tested way of doing business, whereby the manufacturer supports its distributors, without at the same time shafting them by dealing direct.
Beaufort Ink is the largest distributor of Bock nibs worldwide, and if there is anything you wish to know that I cannot answer, I'm happy to find out for you. All of the drawings that you are referring to (not the sections though) are on the Beaufort Ink website, or available from Beaufort Ink. They're all out there, it's just that you are looking in the wrong place for them.