it isn't a pattern. the file is just an illustration of one method for making log cabin blocks. you can use the method on any kind of log cabin. it works well for lots of other things, too. i haven't measured and cut separate pieces for a log cabin in years. i think the only time i did was for the very first one.
just sew as many of the previous patches as you can to the strip of fabric for the next one. trim them to size, open it up and sew as many of those as fit on the strip for the next one. keep going around the blocks like that until it's the size you want.