After you have screwed all 16 brackets together
to the 5 metal panels, you should have a frame
that looks like this. The blank spots are where
the arrow buttons will go. You should have 5 metal
panels that are about 11 inches square and 4
blank spots that are about 11 inches square. The
whole frame should measure 33 inches by 33 inches.
In the diagram, the sheet metal used for contacts looks the same size as the
lucite and peg board panels. But they are smaller 9-1/2 inch squares.