I made mine from Styrofoam. Works great! My starting foam already had holes but it would be easy to do from blocks found @ a craft store too.Check out the thread i referenced above if interested.
Thank you, Eric! I love that place. we are members, we try to utilize all it has to offer.
Here is a link to my flickr. it has a few more shots and some others things we have seen in Cinci.
https://www.flickr.com/photos/emorgn/