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I measured the depth of the fittings at 3/4". I doubled this and added 1/4" to get the small pieces for connecting the elbows and tees together. The saw eats up some amount of the material when you cut, so I like to measure-cut-measure-cut... to make sure the pieces are as long as I want them Try to get the cut nice and straight. If your cut isn't perfect, measure from the part that sticks out the most, that is the part that will bottom out when you put this together, all the imperfections at the pipe ends will be inside the fittings, only max length discrepancies will be visible. Remember to clean up the dust this makes and get all the mess off the ends of the pipe. It helps a lot to have the pipe secured when you cut it. You may want to try pressing these together, don't do it. The fittings are tapered and require a mallet to get in all the way, and are nearly impossible to get back out once together. (don't worry about when you cement them together, they go right in with the cement).
I then cut the long segments, 20 inches left 1 inch extra for the way I drilled 36 holes.
