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If it is feasible to change the method of construction, I would suggest not using timber. The Bubblehome method uses very little timber or it can potentially be timber free and thus avoid termites.
3D printing can also potentially offer another low-cost alternative method. There are 3D printing methods that can use any waste plastic. This would be an excellent recycling/upcycling project and a workshop would need to be established onsite, however I believe it would be financially viable and give the community an ongoing income once the construction is complete.