I keep thinking some one of you genius guys/gals could do this: make a stair base from the chimney mesh. Make it in increments of step sizes and one, two or three stair widths wide. It would have to accept the placement of connecting stairs. I know that another genius figured out how to recolor the chimney, or the builder could simply box it in with walls. Since the chimney can go on the ground, on the foundation or on the floor, such a modification would solve alot of the mess with using the boolprop cheat. Oh, please say it might work ...