We now have 2 PVP arenas built and ready. I placed mob spawners where requested. The whole thing works like this:
The upper arena (the nether-type one) has spawners for pigzombies and blazes. Otherwise no mobs spawn there. The lower arena has 2 spawners for zombies and 1 for pigzombies and zombies can spawn anywhere if it is dark enough. Otherwise no mobs spawn there. Both those arenas have PVP now ON.
What can be done next is a command system similar like the hunger games. This system can place people at one of a list of pre-defined spawn points.You guys have to decide how you want to manage those arenas. And you also have to tell me when they are finished built, so that I can take away the build rights.
The middle arena does not have PVP On yet, please tell me once you are ready to switch it on.