I search a plugin that is like ownblocks, also you build something so it belongs to you ! not world edit or logblock .... ^^
WorldEdit makes spheres and cubes and LogBlock makes records of who places blocks and such. I'm not sure you know what you are doing. Try WorldGuard.
I have world guard already but i want something for users, it is very annoying to protect the house of everyuser xD and i know ownblcks from long ago and i rember that worked well ! ^^