made cabinet before ordering drawer slides.  Size was driven by cheap
marble top from surplus store.
Slides too long.  But, since the drawer does not go all the way
to the end of the slide, they were mortised into the back of cabinet.
Next mistake, forgot back was only 1/2" thick instead of 3/4".
Made jig and mortised all 12 pockets from inside before checking thickness.
Some splintered out on face.  Fiberglass with superglue, and then
epoxy to repair.  Came out ok but huge time & effort penalty for not thinking
& checking ahead.