Sonex Build - Rear Spar Assembly

In this video, I build the Rear Spar Assembly for my left wing.
Music:
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@Sappheiros is an American electronic music producer living in Washington state. He's known for creating ambient tracks mixed with dubstep touches. Although he sometimes experiments with other electronic genres, one could say that his favorite style is melodic dubstep. He currently has thousands of followers on SoundCloud but his most active social network is his TH-cam account.
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[@jeromejanci8318]

why doesn't Sonex drill the proper size holes instead of pilot holes?

[@dan_der_flieger]

I don't know 100% why. Probably so they can be drilled up to size and have a perfect match.