This question could have a lot of answers, it depends who were you asking about.
From our point of view we’ll highlight the uncertainty created by producing a documentary about something that does not exist yet. It sounds ridiculous when you say “We’re going to produce a documentary about something what doesn’t exist”.
A logical order would be to produce the object and, then, tell a story through the documentary.
Exactly in this point we find what special has this documentary: Object and documentary are going to produce at the same time. You’ll watch how problems appear and how we solve it. Parallel to this we are going to see what problems found our collaborators and how they resolved it.