I like the look of the feeder. I am interested also in how the color holds up. You did good making it not look like PVC!
I too agree NO OSB for the walls. Floor ok but not the walls. I personally do not even like it for the floor unless there is sheet goods going on on top of it. It tends to chip and separate as well as to many little nooks and crannies for poo and critters to get into. (Thinking mites)
Regular siding is about 26 dollars a sheet and well worth it in my humble opinion.