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There's not much to it. If you want to copy my design, you'll need:
8'-foot 2x4s (x9)
6" long ½" bolts (x12) with nuts (x12) and washers (x24)
Simpson Strongtie End Post Cap LCE4 (x4)
Simpson Strongtie Tie Plate (x8)
Simpson Strongtie Shelf Bracket CF-R (x2)
Nails for Strongties
3" Wood screws
A hammer, drill, and saw.