Hi, I still pretty much a novice at costuming, but I have taken on a seemingly daunting task for a community event in my home town. My coworkers and I are doing a Trunk or Treat Halloween in our town and we decided to all go as characters from Scooby-Doo. We have a fairly large group, so a few of us are going as famous villians. The one I chose for myself is Space Kook. I have a good foundation on how I want to build everything except the helmet. I wanted to get some feedback from everyone: is there a cheap alternative for making the helmet versus buying an acrylic hemisphere? Thanks for any help or tips you can provide. I'll be posting pictures over the next few weeks of my progress and/or make a YouTube video series on the process.