I made this sawbench following the plans Christopher Schwarz has
published.  I think this design is too much work, particularly the
shelf on the underside, which is secured by 30 nails.  I also found
that getting the angle of the legs right relies on very accurate
cutting of a very small notch in the legs, so it's pretty much
guaranteed not to come out quite right.  

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<img src="wholething.jpg">

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Here are closeups of the wedged mortise and tenon joinery.  

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<img src="endone.jpg">
<img src="endtwo.jpg">

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Some of the joints had rather large gaps.  I'm not sure I understand
why, but I believe that part of the issue is making the mortise
"trumpet shaped" which means that the tenon can hit the side without
being able to fully close up the visible gap.  Instead you want the
taper in the mortise to be smooth, or perhaps a bit concave.  It seems
like there may also be an issue about matching the taper of the wedge
to the taper that is cut.  I'm not sure what the answer there, is.
Maybe test fit with the wedges on the outside?  A last complication is
that the wedges would slip to the side.  I wonder if this might happen
because the wedges are not uniformly thick, but I'm not sure.  (I did
cut my wedges out of white oak by hand saw so chances are they were
not uniform, though I don't think there were really badly uneven.)