Oh, and there is another little trick you can do with this setup...
You might consider using a slightly larger plywood (or MDF) square -- one which will be used as a type of sled to hold the material to be cut. This square will be used as per the demo, but is sized and placed to also extend beyond the cut on the right side. Instead of indexing off the edge of this square, you will add a fence on the top and in a similar manner as the plywood was zeroed in the demo, this fence can have its working face cut in place after it is installed. In use, this, well not really a sled at all type thingy, serves double duty as a backup for the cut. Hmmm, if I haven't lost you yet, you may see that this will allow the one jig to be used with a variety of material thickness -- well at least sizes that are thicker than the installed fence -- in that for rip cuts narrower than the guide rail, you can place a scrap of the workpiece material (or one of thesame thickness) on the left side of the fence to keep the guide rail flat.
Just additional food for thought...
Corwin
Sorry I couldn't do a better job with the above description, but have had a bad weekend with too much time spent at the ER. But, life goes on.