We saw this from our hotel in Amnat Charoen, a province way out East in Issan that is so poor that there is literally only one traffic light in the entire province.
It looks to me like six wooden casement windows in two groups of three, opened all the way, with one by six's balanced on the tops of each group and a long two by six set to cover the long space in between. This genius is using it all as a scaffold to paint some hard to reach spots.
He was out there for quite a while, moving from end to end. We thought that it was a supremely bad idea, but to be fair the boards and the windows held up fine.
This in a country where all workers assume the risk of injury on the job.
But I shouldn't be surprised, really. I have always thought that Thai workers did a very good, solid job on whatever it was that they were making. These windows were hung up there to last.