I have my old kitchen pantry in the shop for general storage. It's 24" wide and 24" deep which made reaching for things in the back of the shelf a real hassle. Not to mention making it hard to see back there.
So I made three pull out shelves where three fixed shelves were. 1/2" sides with a 1/4" bottom panel. I didn't have any thin plywood so I actually glued up the three panels from scrap - this was a great way to use up those "shorts" you can't bear to discard!
They're trickier than they look because you have to get the width exactly right.
Great point. The drawer width was taken on a story stick, not numerically. I first made I side spacer blocks and then made a sandwich on the old shelf with a spacer block and a 1" block (each slide takes up 1/2") and then marked off the gap on a stick.
Observant folks might notice that I made the drawers sideways. Normally the rabbeted piece is on the side to use the mechanical advantage of the joint. But then measuring the length of the front/back pieces also involves the joint. I wanted make this task as easy as possible so I used the full length, rabbeted pieces on the front & back.