Warspite, you should have used EEP Cambodia. Country setup is a bit more historical being that Cambodia also inlcudes Mekong Delta while Champa was moved north to Da Lat. I have worked to diversify my country a bit with events. Some descriptions you would have read are:
"King Ang Chan (1516-66), one of the few great Khmer monarchs of the post-Angkorian period, moved the capital from Phnom Penh to Lovek. Portuguese and Spanish travelers who visited the city, located on the banks of the Tonle Sab, a river north of Phnom Penh, described it as a place of fabulous wealth. The products traded there included precious stones, metals, silk and cotton, incense, ivory, lacquer, livestock (including elephants), and rhinoceros horn (prized by the Chinese as a rare and potent medicine)."
"Angkor, the capital of the Khmer Empire, was undoubtedly as splendid as any European city. It was built between the 9th and 14th centuries as the administrative and religious center of the powerful Khmer Empire. Zhou Daguan, a Chinese envoy in Cambodia from 1296-1297, described a glittering city of palaces and pagodas, palanquins and elephants, concubines, celestial dancers, and slaves. With the revival of the Khmer Empire, the Khmer King wished to bring back the splendor of Angkor with the construction and restoration of buildings and monuments."