Dowels go in next. I'm going to use dowels to join the top shelf and the toe kick to the sides. I finally decided against using dowels for the rear cross-braces, as it would be just to align and drill correctly, and I can cheat using pocket screws and nobody will ever know.
I'm using two jigs for the dowels; the first jig keeps the drill centered in the wood, and the second jig allows me to transfer the position of a dowel from one board to another. Both tools work really well. Remember to chamfer the holes so the dowels don't bind. Test fit everything.
I'm using 3/8" x 1-1/2" birch dowels. Since the wood is 13/16" thick, I'm probably drilling 9/16" deep into the cross pieces, and 7/8" down into the side pieces, as I don't have to worry about poking through the sides.
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Yes, I didn't realize it until I saw my pictures, but I'm wearing slippers. Since COVD-19, the dress code has been pretty loose around here.