Build a "working" tricorder

Step 7 Add front and back to the head

 When the head is finished, the cardboard box is glued to the sides, and the lid is held in place with 4 screws.  So we need to cut the front and back pieces.  With the sides screwed in place, trace a line where they meet the lid.  Remove the sides and trim 1/4 inch off each side up to the lid line.   Screw them back in place, then cut a front and back piece to the right dimensions -- mine are about 5.5 x 1.75 inches.   Don't glue yet!  Screw the sides back to the lid, and dry fit the wooden sides with the interior cardboard box and the phone inside.  If everything works, then you can glue the sides on.  I sandwiched some wax paper between the lid and the sides so I could glue the sides together without gluing the lid in place.