Hey ez, I've seen some pretty cool looking ones made from aluminum. Or you could go with a plexiglass piece or a Lexan plastic. I believe the Lexan stuff is alot stronger and will last longer. Cut it to size, heat and bend. You may be able to find Lexan at a local Home Depot or Lowes. I've also heard that L & L Marine has stuff like that 714 777-5505.
You gotta a pic of that Starbuck? I always thought those were cool looking boats! Is it the tunnel?