Corrugated roofing.
Yes, that's all there was this week. Geoff 3D printed it and Stephen glued it on! The only 'exciting' bit was when a new length of sheeting was required that Geoff had to create from one of the other sheet drawings. One more week of roofing and we can move onto windows and details...
It's the fact that each sheet is separate and not perfect that helps with the overall satisfactory effect.