Added a slight change to the Rock Maker script. It now tells you if you don't have a rock selected when using the Delete Rock button.
Should I include a messagebox that if you are making a new rock, but still have have something else selected in the scene that says "are you sure you wish to overwrite the object(s) selected"
Also the Delete rock button as it stands, will delete ANYTHING in the scene you have selected.
Should I add a filter to make sure it can only delete things named Rock_*