Here are the estimated costs of the things I am buying...

Framing: 2X4X16 (2X) $7.00 each

OSB: (7/16)  (2X)         $9.00 each

Screening: 3' X 27' +  36"X84"   $21.00+$7.00

Screws: 1 lb 1.5 + 1lb 2             $10.00+$10.00

Metal for Cap +Back of box: ~$50.00

Nails:                    $5.00

Dark Green (metalized) paint  $10.00      
Total                                  ~$150.00

Another cost is time.
Once all these materials are in my yard I should be able to build the solar panel in one long day of hard work!!