Transform the open stage-like struc...

Transform the open stage-like structure in the image into a completely enclosed, standalone circular building. Replicate the detailed curved back wall to create a full 360-degree, seamless interior. The new front half must be identical to the back half, forming a perfect mirrored symmetric chamber. All walls must be solid and extend up to the honeycomb-style ceiling, making it a fully enclosed indoor hall, not a cutaway view. The complex floor pattern should be extended to form a complete, balanced circular mosaic.