Castle-role play suggestion

[blalp]

THIS IS JUST AN IDEA

We could link 9 islands together,can't the one in the center of the nine had open permitions(anyone could build there). 

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The dashes are locked perms and the o is open perms.  Then I(or someone else) would set up monster spawners in the area with no perms.  Everyone on the server could work together to survive.  If the people get better, I(or someone else) make the mobs harder to kill.  There will also be a herobrine board in one of the no perms areas, noticing players when the mobs have gotten harder.

This is just an idea, if you have any suggestions please comment below.