if i was going to attempt this i would make sure there was a nice bed of and under the bottles, and enough sand all around them as well, then lay some vapour barrier (could go below bedding sand also). then no less than 4 inches of cob or concrete. not sure what pigs would do to cob, probably wreck it. i like when people try things.
Yes to the sand and concrete layer reinforced with rebar. This method is an old English method for putting in a layer of air and slow down damp rising. I have an almost unlimited supply of wine bottles so....
To lead a tranquil life, mind your own business and work with your hands.
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