So I took this past week off from work, and was making cracking progress on the cladding. Starting to look really good and almost finished 3 sides.
But then, disaster...
The nails were rusting within minutes of cont act with water!!
The steel nails I'd bought were not stainless steel, but a chinese grade "q195". They would all rust and stain over time, so I had no choice but to remove all the planks again. I spent the last two days with a crow bar prizing them all lose again without doing too much damage. The new stainless steel nails will arrive tomorrow