Yeah, but it’s a long place, top to bottom. This was about on the same latitude as Paris. I read about the concepts (spiral construction) from Mountaineering: Freedom of the Hills, Vol. 7, then learnt on the job.
things I learnt: select your spot and quarry (or plastic box) carefully
– have a good, long snowsaw (or plastic box)
– concentrate on the strongest layer in the snowpack for your bricks, even if it means digging more. (or use a plastic box)
– cut (or pack) your bricks thick (30cms). More thickness gives you more strength and more support, you don’t need to taper thinner as you get higher, physics is your friend:
– the amount of grip and support you can get from the 2 supporting bricks as you lay at 45-75-90 degrees to the vertical is amazing.
One of the most satisfying things I’ve ever done!
Bon chance!