Make it out of Acrylic or Plexiglas, that is what alot of people do. I choose Acrylic myself. All you really need is a good size sheet (avail. at many hardware stores), a "Plastic cutting knife", acrylic glue (hobby shops), and a "Dremel" type tool is useful. I have pictures of the final product and some tips for working with acrylic on my web page. It will cost you about $30 (US) to build one.