Some of design form come from domestic architecture influence religion foreign such as; Java, Bali and others province common Austronesian ancestry (originating in Taiwan, c. 6,000 years ago).
The earliest Austronesian structures were communal longhouses on stilts, with steep sloping roofs and heavy gables, as seen in the Batak rumah adat and the Torajan Tongkonan.
Variations on the communal longhouse principle are found among the Dayak people of Borneo, as well as the Mentawai people.
This is my concern interest and I will talk for details Traditional Architecture of Indonesia explain on my next blog.