I am hoping this is not just for folks who want to have the fanciest and prettiest, but the practical too. We are using an overbed camper off a truck. I put a box cover over the sink, they like that box, and have picked up a few small used sinks and placed covers over the heads and they nest...
For coyotes, look up some electric netting, Premier One has some good options. Hmm, if you could set up some overhead electric netting, one good jolt may be all the owl needs to stay away. Or perhaps set up just a roost baited with a live wire, enough to give him that painful jolt. it shouldn't...