Almost four decades of owner-builder projects with adobe, straw bales, earth floors and mud plasters: an Adobe Shed at the Ghost Ranch (NM, 1986); Adobe Home in Boulder (1987); Adobe and Straw Bale Accessory Dwelling Unit (ADU) in Boulder (2012); Second-Floor Addition with interior adobe wall and R.E.I. bamboo – Really Environmentally Irresponsible/Innovative – in Boulder (2015); Straw Bale Shed, a.k.a. “Hippy-Shack Cosmic Makeover” in Twin Lakes (CO, 2019); Straw Bale Post & Beam in T.L. (2023); and Load-Bearing Straw Bale Micro-Cottage in T.L. (2023). What are the Pros and Cons of these different structures? How can the building costs be reduced? What’s the best(?) and most sustainable insulation material for adobe walls?