I'd be interested to see what you decide to do about a sky backdrop. I'm in between on if I want to add one or not.
Yeah it's something I've been going back and forth on. If I do it It'll only be for the long back wall where my buildings are (I'll try to get some pictures tonight). But for the rest of the walls I don't think I'll add the backdrop since the mountains are mostly covering the wall anyway. We shall see though.