I have added in a little more features into FreeCAD/Croquet. Cubes are now rendered as separate planes so that each face can be clicked and more objects can be added to it. The face can be selected by clicking on it and unselected by pressing the Esc key. The cube is now glued to the part frame and when dragged, will move the whole part frame with it. Markers can be inserted into the separate faces or just the part frame to create joints. If markers are added to the face, it’s origin and orientation will be the origin and orientation of the face they sit on. The cube is now a buffered openGL object and I will try to implement the same features into all the other shapes as soon as possible.