I started by planing the rough sawn timber square, then thicknessed it down to 21mm. I then glued any boards that weren't wide enough with simple rub joints. When the glue was dry I ripped the boards down to width on a table saw, then cleaned up the sawn edges with a fore plane. Next, I cut the sides, top and bottom components to length ready for jointing. I cut these by hand using a bench hook and shooting board combination jig. Click here for a guide to making the bench hook / shooting board jig.
After cutting the components to length, cut the stopped housings on the shelf sides to hold the shelves. I cut these with a router with a 12mm straight two-flute cutter and a guide rail to keep the grooves straight.
Next on the to do list; I used a mitre saw with trenching facility to cut the shoulders on the end of the shelves to fit the 12mm housings.
Dry assemble the shelves and sides to check the fit. If like mine, they're slightly too tight, use a shoulder plane or paring chisel to trim them to a nice snug fit.
Pic 1. Shooting boards with a fore plane ready for rub jointing
Pic 2. Finishing a cut on the table saw with push sticks