Foamcore

Adam Savage's One Day Builds: Foamcore House! - YouTube - https://www.youtube.com/watch?v=ssxCQuv3KzE

Board Games Are Better With Foamcore (Even If Only To Look At Them) | The Adventures of a Solo Astronaut | BoardGameGeek - https://boardgamegeek.com/blogpost/53600/board-games-are-better-foamcore-even-if-only-look