Building things halfway up mountains can be a bit tricky…I can see why people generally stick to more accessible sites. We had the Monachyle Beag Bothy foundations nearly designed but niggling doubts brought us back to the site not with a 1.5T mini digger but a proper machine. So no rock, just big boulders and a host of other issues to solve on a site where - helpfully, almost no quarries will deliver crushed stone. Tom, our engineer (helpfully holding a spade in the picture) is designing somewhat out of his comfort zone!