I want to see someone build a completely solar powered airplane, no precharged battery in it! This would be cool for duration soaring or fpv. I know people have done it but I want to see a foamboard version.
Trent from MyGeekShow has just started his next project which is to build the plane you are describing. I think he will be using the thicker blue foam from Home Depot/Lowes, but it is pretty much the same idea. Here's a link to the start of the project and his website.