Things You'll Need
Instructions
Remove the hinged lid to the dry box to get inside more easily. Measure the inside width and length of your box.
Cut the cardboard to the measured size to use as a template for making a shelf. Place the cardboard on top of the plywood and trace a line around it. Saw the shape out of the plywood.
Sand the plywood shelf, then varnish it.
Place the shelf inside the box. Measure your radio components and place them on your shelf to guarantee that they will fit before attaching the shelf.
Screw guiderails on the side of the shelf and the corresponding location on the inside of the box. These rails will allow the shelf to slide in and out.
Replace the hinged lid. Drill holes in the lid where any antennas need to get extended.