Today was one of those nerve-wracking airplane days. I set into place the center spar of my airplane. It's supposed to be at an 81-degree angle, and my difital level confirmed this. Still, there's little room for error with this, and I was really nervous. I'm happy to report that everything came out nice and straight, and little Sharpie lines were visible exactly where they should be - amazing. The position of the wings is now set in stone (so to speak) on N161DR.