It's pretty easy to do. You just might need to invest some $ at the hardware store.
-A power drill.
-A "hole saw" It's a bit that has a normal drill bit in the center and what looks like a cookie cutter with jagged teeth around that.
-A saber saw. Don't skimp out because the cheap ones will burn out quickly.
-Fine sandpaper. If you've got a friend that has a belt sander, the better.
-Polycarbonate sheets. aka Lexan (brand name). It should come with a protective film to protect it's surface during cutting. Peel it off when you are done.
1) Trace the template onto the sheet and cut it out with the saber saw. Do fine shaping and rounding with the sandpaper. It goes a lot faster with a belt sander.
2) Drill out the holes for the cones. Sand out the roughness.
3) Polish the cut edges with acetone solvent. This will make them crystal clear.
When you are cleaning it don't use abrasives, bleach, or water hotter then 140 deg F. You should be okay with quat ammonia as a sanitizer.