Now with sides even, take your combination square and ½” up from the
bottom draw a line across the width of both pieces.
Next, measuring from the bottom, draw a line across both pieces at 6”, 9
¼”, 14 ¾”, 18”, and 23 ½”. These lines mark the area where our holes
will go. Now we need to figure out where on each of these lines the
holes need to be. We used a DVD case to look at how far back from the
edge the dowels needed to be and the distance apart to support the case
and where the support dowel in the back needed to be. With all these
considerations here is what we came up with. On the bottom line
measuring from the front edge of both side pieces place a mark at 2”and
5”. Do this on every other line up both pieces. These are where the holes
for the shelf dowel will go. Now, for the other lines on the side pieces
that you skipped over before, measure from the BACK edge this time
and place a mark at 1”. These are where the holes for the support
dowels will go. The following pictures show the placement of the lines
on the side pieces.