This Instructable goes through the basic steps of making a simple plywood frame to slide a salvaged white board into for the front desk at Techshop...
Step 1: Decide on construction
This frame was designed to be cut out on the shop bot at Techshop. The basic design is two horizontal runners with slots that the white board could be easily slid into. Between these two runners would be four vertical runners to support the flex of the white board while it was being written on as well as to structurally hold the whole frame together. The frame is mounted on a black pipe frame and essentially hangs by pipe clamps so the plywood frame structure needed to be super strong and rigid.
The horizontal runners are 1.5" thick, 4" tall and 48" long. These runners were created by stacking two pieces of 3/4" plywood together with the thickness of the whiteboard taken away from the thickness of one of the two stacked pieces to create the slot for the whiteboard. The included drawing attempts to show this via a cut away view of the stacked pieces.