About this 3D model

what is the cross between a pencilcase and a puzzlebox? a lockable Puzzle-Case (with hidden drawers! :-) includes: - 3 rulers wich can be combined with joints to a 54cm ruler; - guiding rails in the main compartment - to use the rulers as seperator - two hidden drawers (need additional steps to unlock) - the key to lock the box is the pencil topper (literally)