concrete can be surprisingly costly.
what do these cost?
My post #81 :
"The pods are still at a prototype stage, but The South China Morning Post reported that if the plans come to fruition,
each OPod will cost around $15,000 (£10,885)."
Mass production should reduce the prototype cost to something more reasonable.
With reduced cost, the possibility of adding additional OPods/ pods could offer expanded housing or specialty rooms.