A big hat tip goes out to Draculya for this submission
Peter Sripol is something of a legend in the DIY RC aircraft crowd. He’s friends with Flite Test, and there he built an enormous RC cargo plane that could easily carry a small child aloft. Now, Peter has built an ultralight — a manned ultralight — in his basement.
It’s made out of insulation foam. You can see the extremely interesting original post and ‘building of’ video here: Building An Ultralight From Foam In A Basement
Well now he has really amped it up and is actuallyy test flying this contraption. He is braver than most sane men.