I found this on a welder's discussion group. They had an "interesting" time building it. [URL]http://metalworking.com/DropBox/tiltingroofline.JPG[/URL] with CAD. The dimensions were given to hundreths of a mm. That indicated to me that the draftsman didn't have a clue about initially calling for his dimensions to be rounded off. The drawing were complete but confusing in what they left out. CCW and CW : the beams were twisted along their length by a custom bending shop down the street. 1.4 degrees twist every five feet is not much but necessary to get things so line up square and the beams meet each other. The beams joints are slightly off square. Because it is so slight you cannot set a protractor or bevel gauge on the joint. The only way was to confirm the diagonals across each bay. The diagonals differed about twenty mm or so. There were no bolt center dimensions on any part of the print. That mean't we had to trial bolt each adjacent framework as we fabricated it up. Taper pins were used often because the frames were quite flexible. We proped the frames in the skewed postion for the welders so that they didn't weld it up sitting flat. I still say today that I would not have liked to listen to those poor ironworkers putting this thing together. I am sure they even invented some new cuss words over this one. For the privacy of the owner I will only say that the structure is being built in the Vancouver area. The welding was pretty straightforward however the fitting.... that is why us fabricators make the extra couple of bucks :'))). <SNIP> ,,,there are two lines on the roof that are level. That means there is one beam line level running across the roof and at ninety degrees there is another. Those two lines are not in the center of the roof. What was a real pain was a 12 inch square half inch wall tube that ran diagonally across part of the roof. We had to cope both ends to fit the twelve inch beams and at the same time cut to allow the tube to drop in elevation. The perimeter framing was twelve inch beams with the flanges cut off until they were only two inches wide. It was like trying to work with spagetti."