The 3 main area are:
the first permit the Drag & Drop from a picklist to the drag area where objects can be moved, oriented, deleted, changed in colors
another picklist is made of an ecommerce-style lists of objects withi wich the user can search and find new object to take
into the drag-drop area but is not part of the actual customer's order
Another area is a simple basket the shows the total cost of the buyed object.