I can see the differences between Wang Kao and Wang Mai, and they're both beautiful! Wang Kao reminds me of the huts we had here in the Philippies back then, they also had those pillars that raised the house from the ground. The space between the ground and the house were normally used to house chickens. Wide windows were also the thing so as to let fresh air into the house. These are lovely pictures, my friend! Kudos to your sister, and thank you for writing about this too. I've taken inspiration from you. Much love from the Philippines!