The wall and roof construction used the same method as the floor detailed in this post. The following video details the construction process. This method is taken from the Popup House concept for permanent houses in France.

The simple materials list includes polyurethane foam, plywood, screws and glue. All panels were designed in 3D CAD software and ordered to size. This ensured everything fitted level and square with very minimal tweaking. Panel sections were pre constructed on a flat level surface before being erected and attached to the sub floor. The roof panels were glued to the walls and secured with brackets.