Hi Brino,
I have been to those sites. Like you found, these is little info available. I understand the basics of hobbing and succesfully made some gears. But I know there is a lot to still learn!
Figuring all the change gear ratios is tricky. I made a spreadsheet to help calculate the proper ratios, but I dont have a full set of change or feed gears. I am going to start making my own now that I have a Mod 1.25 hob