Larch does turn gray, but as Karsten already said, that is self-protection. It is also durable without constant painting. If you want to paint anyway, you don’t need larch. Didn’t we already discuss that in the [Holzterrassenthread]?
As soon as I hear painting, I feel sick. As a child/teenager, I had to paint my father's fence every 3 years. It was over 50 meters of fence with small and narrow bars.
Climbee, great photos and really a great project to follow! One question comes to mind, how does the ventilation work in your house, were any special measures taken to avoid condensation especially on the basement walls in summer?