Build a Shopping world

I want to build a shopping world like this.

Is there any three.js sample for building such world on github ? I built this so far: .
I got a nice skybox, but still not happy about the quality. My world does not have a very good look and feel which is as good as this attached image.

Does the quality of my three.js world depends on the quality of the 3d models I buy ? Or the architecture ?

The more high quality 3d objects I add, it increases memory consumption. Does this mean that the web is not ready for such solution yet ? or ?

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