This weekend I’ve been getting on with the interior skinning of the enclosure. This is an important part of the build not only because you obviously need an interior surface to keep out the light and enclose the cockpit, but also because it imparts a greater degree of stiffness to the whole structure by filling in the gaps between the framework.
The material of choice for the inner skin is 6mm plywood. This is not particularly strong (you could punch through it without much difficulty, I suspect) but it is light and flexible and the strength it does have is lateral – it would be much harder to pull a piece of plywood apart from the ends than to break it by going through the face. I bought a few sheets of this in my last wood drop, and now it’s going into use.