Thanks and all credit goes to Derek for this nifty little tool for those of us looking to gain some accuracy in our tenon cuts. I found this while surfing Derek's blog; In The Woodshop, and as he kindly and sympathetically notes, it's a great tool for those of us challenged by a straight saw cut.
For those interested, please visit his blog, but here's a brief build:
The components (sans hardware)
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I started by creating the mortise in the sliding top piece:
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I then squared up and glued/screwed together the "L" of the main body:
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The "tenon" was attached and "through mortise" drilled and filed:
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Continued....