Son wanted a silo for his HO layout so, I built one out of 3" pvc and notched it for the belts and run through track. Printed front and back flag onto sticker paper wrapped around (piano wire) pole. Poly styrene scraps for hand rails, I don't like the section lines, I didn't tape the gaps close enough and painted them too dark. But, my young'n likes it. Don't pay attention to the backdrops, he didn't want me to finish the mountain or sky.