Partially @Tranquil Hollow RR. The middle of the layout includes the yard that diverts to the different parts of the mill and I plan to have a backdrop with another steel mill back there. The ends of the layout will just have sky backdrops painted blue to match the backdrop sky where the backdrop mill is. The reason for not continuing the mill backdrop is that the ends of the layout are hills to hide the whole bit where engines overhang on curves and because that's literally the back drop of the mills where I'm from; the Mahoning Valley. It's got hills on both sides. So It works for me on a few different levels to have hills there.
This thread I made has some pictures in it and I don't know the science behind it but it seems like the flat black ceiling is like a green screen for the brain. It's like your brain says "ohh, it's empty space. Ignore it." and it disappears. At least that's how it goes for me. That's the main reason I'm going with flat black.
