I've read about this, and have found the govt website, but the designs all seem to be new build constructions, which look terrible. Perhaps, like you say, an actual visit to an office might offer different info.
I'm planning a build in Bueng Kan - approx 50kms East of Bueng Kan town - in a small village by the Mekong. Most houses there are standard cement downstairs, wood upstairs, but I'm planning on plonking a shophouse-type building there, with a few twists too, but I'm trying to gauge what's possible.