One of my last years Covid lockdown projects was to make a cheap hot wire foam cutter. It worked (video is linked in description ) and I cut a few wing profiles (check out the video. ) I turned my favourite cut into what I thought was like a Mini FT Versa. It turned out FlightTest had already done similar with the FT Arrow. Anyhow I finally got around to a maiden flight. The foam was cheap. A scrap of insulation foam I found in a skip! Quite firm and high density, but very light. Still haven't built a unicycle and learned how to ride it. That was the other project.