Taking into notice that the build competiton is around the corner i would like to suggest that worldedit may be given to players during the competition so players dont have to spend hours of their time in creating a build and so that there may be bigger and cooler builds present. Moreover, to make it less overpowered you may remove commands such as "super pickaxe" or any unnecessary commands which would ruin the fun or be of no use to the players. Furthermore, these commands could only be used in the plot world and nowhere else.