I am planning to design a device that can transport fragile objects to the top floor of a building 40 feet high without damaging the objects. One of the requirements in addition to safe delivery is a flag mechanism that will signal that the object has been delivered. How and what should I consider in my detailed design comments? Why is choice important? I also need details on the safety, cost, schedule and technical considerations for the Preliminary Design Review PDR and Critical Design Review CDR, which should be discussed with my team on this prospective project. Thank