I'd add that for a diorama like this you could probably get by using Sketchfab instead of Three.js. When the focus is on the art it makes it much easier to get

I'd add that for a diorama like this you could probably get by using Sketchfab instead of Three.js. When the focus is on the art it makes it much easier to get assets imported, lighting set up and working right, camera controls, etc.