just get road changes around your res with dirt walls so you can tp in and noone can see. on the day it opens, tell a senior staff in advance a date and time to make it back to normal. Would probably be better IMO
I hate to break this to you, but trying to keep something secret isn't possible in Minecraft unless people don't know there is something in the first place. Tell someone that you are keeping something secret and they will just download the area anyways and look at it in single player. Preventing packets loading to block this isn't possible.
That seems like a LOT of work to go through for not a lot of benefit IF it even works with our present code. If you really have that much problem with people seeing your builds, try not advertising them. People's curiosity can't be peaked if they don't know there is something going on in the first place. Aikar has enough on his plate at the moment that involve actual game mechanics
