My in-laws built one of these in the mountains of New Mexico north of Tijeras. Not quite this extreme - they stopped short of the indoor plants and bottle walls, but 3 of 4 exterior walls were rammed earth in tires, giant south-facing windows to maximize solar gain in the winter, off-grid solar and a metal roof to catch water. It looked really nice (walls were finished with stucco) and was in a beautiful spot on a south facing mountain slope. They eventually sold it for a live aboard boat, but it was an incredible place for the couple decades they were there.

I would love to live in an earthship. I will say, builders/owners should develop an instruction manual for all of the off-grid systems. They're all a bit unique and visitors will be totally unfamiliar with their operation and peculiarities.