From my perspective, the 7 degrees angle runs along the plane of the back to front corners of the square leg, not along the red or green axes of the leg. I can’t figure out how to do that angle in Sketchup.
I hope that makes sense, and appreciate thoughts anyone has.
One easy way is to draw a rectangle and rotate it to pass diagonally through the leg blank . Use that rectangle as a reference for aligning the protractor of the Rotate tool and rotate the leg blank to 7°.
I worked centered on the blue axis and origin so that I could simply Rotate/Copy the leg component after the first one was positioned.