Randje Mitchell

Where are you building?

What you are really discussing is the psychology of the human ego.

Its ubiquitous presence touches and alters all human interaction, needless to say. Community is a bit of a casino as a result.  It is also--sorry to inform you--more than a little bit a spiritual issue. The more inclined toward Oneness-consciousness the mind is, the less dysfunction manifested among family members. Yes, we are all family here, and those who have an inkling of this essential truth do much better in conmunity life.

Good point. Humidity never sleeps. Good venting is crucial to this scenario. I'd think about stabilizing the bags wirh lime or (horrors) even cement, for insurance.
Yes, it ups the cost factor, but this is a permanent dwelling you're shooting for, and some chances are not worth taking.

Yup...double-bagging would put you over the top I'd aver.
Pun intended. You well free of seismic activity? Be tough tying rocks to the bags...

Jason:  Howz it goin with your project?
I'm an elder American who fled the impending collapse of America,  currently teaching english in China. Looking about for community...saw your 2016 posting. Thought I'd invoke a "follow up." Can't get Facebook here...

I'm inclined to agree with Joseph.

I have a lifetime in conventional building, and my rule of thumb is to make it stronger than you think it needs to be. "It might work" is a tad cavalier when considering potential catastrophic failure. A bed in the basement? I wouldn't sleep too soundly, myself. The worst case scenario makes it a foolish gamble. Actually, the other way round is ideal; rock basement, EB domicile atop, but you seem set.