I have the castings and plans from CES in the uk but it may be a few yrs. before I get to them. There's been some articals in the MEW magazine lately about cutting helical gearing with one. There about the only small machine around if your not set up for 4 axis cnc.
Yes, the red stuff is rust - I live very close to the Chesapeake Bay with the salt air. I have since heated the shop so this has been reduced somewhat.
I am in the same position as Pete above, I have all the castings plus everything printed about how to make and modify it to cut all types of gears.
But I don't think I will ever build it as I am going to try to freewheel cut plain spur gears using all the commercial hobs I have, and if that works, I will have no use for the hobbing machine at all.