For speed, safety and economy in warmer climates with cement available, the ecoshell is a good choice. A 3or 4-man crew could build one in 5 or 6 days and if basalt rebar is used it will last for centuries!
You can reuse the air form, about 100 times or more before replacing it. See David Souths video at:
If cement is not available use earth-bag construction or rubble stone with gabion bands see videos and a link to the engineer that developed the gabion band system at:
For organizational helps check out Lora Garrison’s Master’s Thesis on International Volunteer Training Manual
http://www.dftw.org/news-feed/dftw-featured-in-master-s-thesis
For Blockchain help go to the Bitcoin Pub, sign up, it is free and it is full of helpful people, when you get into the site go to the water cooler section to ask your questions.
I hope this helps
Dave (retred-early)
Thank you very much!! Utterly useful!