I came across some interesting videos today about frames, they are not fixed specific but they are road bike specific which is plenty good enough, especially if you are converting an old bike. They are by Georgina Terry "The first and last name in women's cycling". In the four videos below she basically works through the names of all the sections of a frame, how everything is measured and in the final two how a designer goes about fine tuning the size. I found the first two to be particularly interesting and the second two will help tall or short people understand how to find a frame that suits them. I am currently on the lookout for a new frame as I think mine is a bit big, I'll be wielding a tape measure everywhere I go from now on!