Recreate ONLY the large Roman pavil...

Recreate ONLY the large Roman pavilion above the circular pit. Ignore the underground interior. Make a complete circular structure approximately 120 blocks outer diameter. Use 24 evenly spaced tall quartz Roman pillars connected by a white quartz ring. Build a huge open skeletal dome above them with 24 complete curved quartz ribs meeting at one central oculus. Add a 6-block-wide dark deepslate circular observation walkway inside the pillars, separated from the pillars by a grass garden strip. Keep the entire center open. No roof filling, no floating blocks, no incomplete ribs. Prioritize simple clean geometry and symmetry over small details.