Hello,
I love the potential of this plugin. I would like to suggest a few things that I think are very useful if implemented.
#1. A config file where the owner can choose what gather rate they would want for a player owned grid.
#2. An option that makes raiding a structure inside of a grid harder for anyone that doesn't own that grid, or isn't in the clan that owns the grid by reducing damage to raiding materials by a percentage. This can be decided in the config file as well.
#3. An option in the config file to choose what item can be used as the land claim item.
#4. A message that can be crated when someone steps into and out of a grid that is owned. Something like:
ENTER: "You have entered the claimed land of {playername}"
EXIT: "You have left the claimed land of {playername}"