LEGS: First cut you outler leg trim at 68 1/2 from a 1×2 board. Not that you will cut the legs at a 10 degree angle on both ends. You will need four of the outer leg trim pieces (shown in red above).
Then cut the inner leg trim pieces, at 10 degree angles, overall dimensions listed above. You will need:
4 – 1×2 @ 6″ (Bottom Trim)
16 – 1×2 @ 13 1/8″ (Trim Between Shelves)
4 – 1×2 @ 4 1/2″ (Top Trim)
Cut both ends at 10 degrees as shown above.

SPACERS: Nail the inner leg trim pieces to the outer leg trim piece, as shown above. Leave a 3/4″ gap between all boards, resulting in slightly over 1 1/2″ gap at the top. Use glue and 1 1/4″ nails.

SHELVES: Cut 5 - 1×12 @ 48″ (you can cut the shelves slightly smaller to get two shelves out of 1 eight foot long board). Fit the shelves in the gaps left between the inside leg trim pieces. Use the measurements above to help guid you centering the shelves on the legs.
Nail the shelves in place using 2″ nails and glue, through the outer legs into the shelves.

INSIDE TOPS: Measure the distance between the top two legs and cut from a 1×2, both ends mitered at 10 degrees, 2 boards approximately 23″ long, 22 1/2″ on the short point to short point measurement. Nail in place using the 1 1/4″ nails and glue.

TOPS: Cut 2 – 2×2 @ 10″ and predrill from the outside of the legs into the ends of the 2×2. Keep the outside edges flush.

Leg Bases: Cut 2 more 2x2s @ 10″, and predrill and screw in place, as shown above. Keep the inside edge flush, lining up the bottom inside corner of the 2×2 with the bottom inside edge of the legs.

Measure from the midpoint of the 2 boards from step 7 and cut a stretcher, approximately 43 1/4″ short point to short point, from a 2×2. The ends are mitered at 10 degrees. Predrill and use screws to fasten.