[taliaegh] wrote in message
...

Under the back for support will be a .5" x 1" x 48" (w x h x l) board.

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Your posting suggests that you have no hands-on experience with the
structural limitations of wood or metal. We all started there. The good
suggestion of doweling intermediate vertical supports, for example, requires
more than beginner skill at woodworking to make the holes align, and
"standard metal shelf braces" includes many types that would be inadequate
for your design load.

Are you planning to build this yourself?