Im thinking about building my own. I have several that had spin motors on them but they died. Mine are hanging style. I try to find a large limb, preferably an oak. Ill use an extension ladder to get to it and drill a 1/2" hole through the limb maybe 6 feet from trunk. Ill put a large eye bolt with an extra large washer on top. I put a pulley on it with attach a boat winch to the tree.

I drill a hole through the barrel and use a 1" x 36" threaded rod I will use metal washers with a piece of inner tube as a gasket and a couple of nuts to make it watertight where the rod enters the barrel A couple pieces of chain and it is ready. for the gravity feeder ill use a toilet flange on drum and glue some pipe with a Y on it...