@karlos@en.osm.town @Olm_e @magnus919
Hi! NeosVR is almost what you described.
It supports: teleportation to another server (and taking your avatar with you together with personal items), object creation (both 3D modeling and programming with a visual scripting language while inside VR), they did have some problems with crypto bros but that is currently getting ironed out (I hope). It is not open source, currently.
Here is a video where I showed some basics: https://youtu.be/bi3qdG_8yCM