How-To Build a VersaTube: Plumb/Line and Installing Hat Channel

Randy is an expert at building VersaTube structures. This is a step-by-step series showing us how to build a VersaTube RV Carport.
In this video, he shows us how to plumb and line the building using hat channel and string line. This is a very important step that some people skip and regret later. ALWAYS plumb/line. He also shows us how to install the first pieces of hat channel.
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[@diycrawlspacedigoutunderpi4201]

Would that not be "plumb line", not plum or plume as written?

[@RamsinGabriel]

I just want to know why the hat was blurred out.

[@karenromero1703]

Wish they made a single slope roof line.