well yes it would be "cool" though compleatly impossibal and a compleat wast of time. Though it is but too easy to make a sphere with world craft these days it is but impossable to program such a thing as "gravity within a certain circumferance" as in being able to walk upside down as on the other side of the "planet" there would be another charecter walking the correct way or what way would be correct if such a circumstance arosebeware of all whom is to enter this forum
go to hl rally and check for any up to date information
this is where i leave