Custom construction planes are a useful feature, and would benefit greatly from these basic added functions: 1.) The ability to delete a saved custom construction plane 2.) The ability to rename a saved custom construction plane and 3.) Saved custom construction planes should be stored permanently within saved project files (at present, they disappear upon reloading a saved file). These will help the user to maintain consistency when designing and modifying complex parts and assemblies, and provide workflow continuity across multiple work sessions. Additionally, this is a very important feature for anybody designing castable, manufacturable or 3D printable components, because construction plane consistency will allow for the definition of "direction of draw" (the vector along which a component is removed from a mold).