it took me about 3 hours to make the land flat + do the whole bottom layer circle 7 times high... then i did like.. the circle going in the air ..to make the sphere kinda thing. and that took about 2 and a half hours.. doing about 6 layers across of it.. both ways the rest took about 4 hours it was hard lol. still not perfect but i hardly leave the dome to see its wonky on one side. only thing i hate is when creepers spawn INSIDE.. i cant actually run away... anywhere i gotsta kill em :3 tehe
oh, so its not on the server, you should make the floor out of glass, creepers won't spawn on it then.