Gary, saw and router guides are a big help when cutting panels free hand. Instead of spending big money for one make your own out of 1/4" Masonite and a piece of 1"x2". Glue and screw the 1"x2" onto a piece of Masonite 12" wide. Using the strip as your guide trim off one side with your saw, the other with a router. It is super easy to clamp this guide to a full sheet of plywood or any smaller panel and you know exactly where your cut will be.
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