mrcrazy_monkey, I just realized you've built the Nether base in such a way that it completely surrounds the teleporter tunnel on all sides except downward. When it's my turn again I want to build a second tunnel, but I can't place it left or right of the already existing one without destroying part of the base. So what I'm going to do is rebuild the current tunnel further down, and all future tunnels will be built here. Building anything in front of the tunnels is at risk of being destroyed if a longer than usual tunnel needs to be built, and building anything to the left or right of the tunnels is at risk if someone wants to build a new one. So I'm asking you and anyone else to please keep it in mind when building in the Nether.
I'll make sure to clearly outline where the boundaries of this level are when I get the map, so you wont need to worry about accidentally building anything there, but anyone who is going to be on the map before me should probably avoid building anything directly below the current tunnel just to be safe. Building anything on the same level as the current tunnel is fine, as is building anything far below it, as the new tunnel will only be a dozen or so blocks below the current one.