As much as I would love for Angkor Wat and those temples to be implemented, being strictly historical, they would not be a good general base to create city graphics for the region, though one could exaggerate that the Thais, Burmans, Khmer, Cham, Laotians, and perhaps even the Indonesians shared similar architecture. However, that stone-building period had eclipsed by the EU2 time period.
I believe more modern wats (temples) would be a more realistic example for the region. Here is a site that shows some:
http://www.arrakeen.ch/asia2004/cambodia2004.html
Also, type in "wat" for a Google image search.