of Hub?
I shall describe what I mean with a really low qaullity hub I made in the past 20 minutes.

this is the hub, You have portals that lead to the following
Server list, RTB overview, Quit Game, Game mode changing, Making a hub, Steam Green light, Options.

You enter the game mode portal to change the game your playing.

You enter the options portal to make blockland fit you more.

You enter the make hub portal which clears bricks so you can make your own hub. There are seven new bricks in your special tab that lists these portal bricks.
Get the basic idea?
Read the other post that describes it in more detail. Please note the pictures of it "working" was me just having fun with the camera.