Further comments:

So what about land? Well part of my thoughts about "land NFTs" was that probably in the Milieu they should be owned by planets, not by the players.

Just like those OAR cards you have of certain maps in OpenSim Archive form you should allow the player to own that as an "NFT" - deed if they own the land in the game on a planet and allow them to trade it on-chain outside the game to other players so if they enter the game they can go claim that land on that planet if they give the "planet" the NFT for their duration on the planet. Give the player the option to take back the "NFT" - "deed" with them if they decide to leave the planet still owning the "land".

The planets, or various governments attempting to govern the planets, could issue NFTs that amount to some kind of representation that they at least pretend to in some way uphold or enforce or at least attest to some kind of rights the holder of their NFT might have over the land it refers to, but the actual land itself as an NFT should be held in the account of the planet or solar system or pocket-universe or whatever that it is "actually located" in.

Yes, you still owe me my Ambassador House whenever I'm in town and no you may not sell it or rent out my top floor beds without me getting a cut of the rent money ;)...

#IReadILikeItWhenDoWeBegin

If anyone can make it happen its you man. This sounds great.