K1 bill of materials top and bottom: 1/2" Birch Plywood available at any lumber supplier ground layers: Aluminum Foil at the grocery store playing surface: Low Density Polyethylene sheet: 12" by 12" by 1/16" thick http://www.tapplastics.com/shop/product.php?pid=410& carriers: copper foil tape, 1/2" by 36 yards http://www.mcmaster.com/#76555a648 carriers substrate: 3 mil polyester (Mylar) film http://www.tapplastics.com/shop/product.php?pid=255& dielectric: 12" by 12" by 1/16" thick Super-Resilient Silicone Foam Rubber http://www.mcmaster.com/#8623k139 bump, spacer: anything nonconductive and shapeable, I used cheap soft 1/8 plywood randy@madronalabs.com January 2009