I will be attempting to build a new chimney in my old farm house. I dug out my basement (by hand) and made a crawl space into a full walk-in basement. I needed to tear down the old existing one because the base was to close to the rafters and was in terrible shape with ceasol dripping everywhere from the attic down to the basement. My house in constructed in the old bost and beam. The chimney is located almost in the center of the house. The openings between floors is a square all tied in with the post and beam. Could someone please give my the opening dimension for those openings? I really cant make them any bigger because that is part of the main structure to the house. I was thinking if i had to i could cut off a little of the block on all sides to make it through those openings in the floors, is that ok to do? One last thing, does anyone have any info about getting started at the base, clean-outs and so forth?