HiPrasert,
Your dio is amazing, I especially like the weather effects of the rail way.
Hue's house didn't have flat roof top like the larger house, and rarely have small room on top like that, your house style commonly be seen in Saigon than Hue.
Hue's house didn't have so many windows like that, they only have windows on the front, some got small windows on the side. Houses with many windows like yours could be seen in the country side of South East Vietnam.
If one house have windows on the rear they always have the door on the rear too.
Regards.