Nepali sculptor Manhari Maharjan, who worked on the project, says the Chinese team could identify the carvings of designs.

"If a window needed to be repaired, the Chinese team would examine the window and invite us to discuss whether something was missing."

Personnel on both sides then compared the existing windows with pictures of the original ones to find and develop missing parts before they "created a window like the original one", Maharjan says.

Yuan now is busy putting together a permanent exhibition displaying the restoration process of the Basantapur Palace complex.

"We hope it will help carry forward cultural heritage restoration concepts and technology among the public," she says.

Xinhua contributed to the story.