Yeah, I've made my own w/ Nidacore "scrim" for the same reasons. What I meant was I hope they get the material much cheaper in bulk quantities. Some of the un-glassed structural foam is crazy expensive if you have to buy in small quantities, even from a wholesaler.
They cost us more than that to build, but we have a molded gelcoat finish on one or both sides and more glass on both sides so you can burn some out and glass 2 pieces together. These are 1/4" H80 panels in the pictures being used to finish the interior of a molded house top.