The remaining ruins demonstrate 17th-century Western engineering techniques, using large bricks coated with lime mortar. The wall structures are exceptionally thick and feature rounded arched window openings, a blend of European and Ayutthaya architectural styles. The foundations of the octagonal tower still show traces of the structural integrity once needed to support heavy astronomical instruments. Erosion on the plaster surfaces reveals precise brickwork, reflecting the collaboration between French architects and Siamese craftsmen. Despite decaying over time, these brick remains continue to tell the story of scientific prosperity and intercontinental friendship.