Okay, I haven't tested everything into deepest detail and most of my information comes from hearsay and asking around.
But I did see that I can allow different people to access my plot or my structures. In this context I heard that the lowest level of granted access applies, for example:
I can allow my entire plot to be visited by everyone but can set the flag on, for example, silos or the like, to be only accessable by me. Or by my guild.
I can also allow only certain people ("Friends list") to access the entire plot - but I was told, in that case nobody except these people can even WALK over my plot.
My problem is this: Why can't I let only certain people access certain structures? The "Friends only" flag is only available to my entire plot. I have a dragon friend who wants to purchase a lair close to my plot so we can be neighbours. I already put up 3 silos for him (which I am building atm) - but why can't I grant him special access? He is not in my guild. I am thinking about putting the silos on "access for everyone" because I live in a very low populated area - but it shouldn't be that hard to just add that "Friends only" flag to certain structures, should it?
Please tell me what you think. Or if I there is a way to do this (in which case you are welcome to flame me since I deserve it for not testing it excessively ;) )
PS.: Sorry that I didn't do a search on this topic. My apologies if it was brought up before.