[moring]

This is the right point to mention "How Big Things Get Done" by Bent Flyvbjerg. You can iterate your design without putting lives into danger.

"I spent weeks planning" -- using the terminology from that book: No, you didn't spend weeks planning, you spent weeks building something that you _thought_ was a plan. An actual plan would give you the information you got from actually shipping the thing, and in software in particular "a model" and "the thing" look very similar, but for buildings and bridges they are very different.