We have a maker in the community Arkin0x who from my knowledge was the first to explore the metaverse / cyberspace concept on nostr. I was crazy excited to such kind of project, but it does look like a great deal of technical, creative, and planning work involved so i get it why you want to focus on the design side first.

I'd advise to check out Arkin0x and Onosendai

\- https://bolt.fun/profile/1267/arkinox

\- https://bolt.fun/project/onosendai

Perhaps there could even be a collaboration, between these virtual spaces.

Keep at it!