I think these are good ideas speaking broadly, but are quite extensive in terms of implementation and getting them right.

Organization would be mutual. Moderators of each have to approve to join and remain in the hierarchy, though the “initial structure” of the community could be set up by admins I suppose. The sub community inherits “global” rules from their parent communities, but can have their own rules as well.

What do you mean by this part? That if I as a mod of television@piefed.social incorporated another community into this hierarchy they’d essentially be a feeder community and I’d effectively be a mod of that community?