Thanks for posting. It looks like it works, very clever, but I am always checking on my measurements (measure 3 times cut once!) and I think the 'net out' approach that ruler system uses would make it hard for me to check myself. The only time I have had trouble is measuring a long piece of fabric and having to put two rulers together and making sure I didn't have one ruler with full-inch and one with half-inch - but I double check that with a tape measure before I cut.
Hey, whatever works to get your job done is what you should do.