Hi Jack! you ask great questions 🙂 I haven’t built any robots yet, but I ve used a lot of incredible submarine robots. These things are really incredible, they perform very hard tasks in very harsh conditions, like extremely low temperatures and very high pressures… in fact, these pressures can go up to 11,318 tons/sq meter, which is equivalent of one person trying to support 50 jumbo jets! yikes! Have you attempted to build a robot? some smaller simpler ones can be built within minutes, while others take months (like my robots) to years (some humanoids have taken up to 15 years to build). Hope that answers your question. Great job!