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Enlarge photo 1
The engineering challenge is to get the 3' tall x 2' wide board to STAND UP!  Here they have used hardware store "L-brackets" on both sides of the bottom board.  Good Design idea

Enlarge photo 2
Another L-bracket design.  This one is stronger and provides more rigidity to the board since the L-brackets are longer.

Enlarge photo 3
Thin pegboard is wobbly.  Using the longer braces gave the vertically standing back board more rigidity.  Good design idea.

Enlarge photo 4
Shelf supports as vertical braces.  The ones in the back were a bit too big, though.

Enlarge photo 5
Plywood backboard & plywood base.  Vertical rigidity is provided by the triangular-shaped end pieces. With one of these on both sides, the project was nice and stable.

Enlarge photo 6
Here the vertical orientation is provided by slotted 2x4 "feet."  This worked fine, although you have to have a 'snug' fit in each slot to keep the vertical board from wobbling.

Enlarge photo 7
Another "slotted" 2x4 foot design.

Enlarge photo 8
Slotted 2x4 "foot" design