I agree a - beautiful plane elegantly designed for the mission.
Think about it for a minute- no GPS, loran,INS, no radar, no radio altimeter, engines that had a usefull life that ranged from 50 to 1000 hrs, insturments that were totally mechanical, radios that may or may not work if there was a signal to receive, and the list goes on.
Hand flying an overloaded, marginally stable, noisy, uninsulated airplane with little FWD visibility across a cold ocean. Staying awake around the clock in freezing temps, while rationing your coffee and sandwiches- and NO Bathroom! Thinking about the earlier attempts to try the crossing- and the deadly consequences of failure.
Barometiric strip recoreders later showed that he lost thousands of feet of altitude multiple times in clouds / storms, and recovered the craft and kept on going. Talk about balls!