I made the drop axles.
I machined the stub axles and welded it in the square tubing with the angles cut on it. Then welded that to the frame.
Then on the other end of the drop axle just welded a through hole on the drop portion that takes a 5/8" bolt into the threaded stub which is welded to the frame.
Theres a little stop welded so the axle won't swivel down past where it is secure to the frame when lifting the shack.
I zoomed in to the best pic i have to show it.
https://postimg.org/image/7h40kisg1/