i agree with oracle and exxxe:
oracle being pve instanced to the individual that will enable a certain amount of kingdom building.
exxxe being allowed to have more than one castle or "alts", i like to have one character per castle, as well as mixing the races of the characters. 5 to 10 legal "alts" or castles also enables a certain amount of kingdom building. resource colonies that are won from balur and retained for a certain amount of time, 1 week or 1 month or some permanent, that is what instanced pve that is a resource gathering mechanism is.
i also agree with djmoody that players castles are not the way to build a kingdom, yet like the op, that is what i want. "to build a kingdom"
the only 2 good mechanisms of this game IMO are that you can come back to your account after an extended period of time and that troops don't starve to death.
the op, oracle, and exxxe have stated what i stated many times.