Players with Astral Travel cannot:

• Interact with most blocks (tag controlled)
• Deal damage to non Astral mobs
• Break non Astral blocks (can be controlled with tags).
• Pick up most items (tag controlled)

We probably also want to stop them from opening crafting table UIs

It should be relatively trivial to allow astral players to open any gui but not interact with any of them, if that's what you want.

That's what I would like. Are there any examples I should look at?