Unable to locate Big Dipper through Polar Axis Finder
My guess is that the drawing is a "cartoon" and not to scale.

The declination of Polaris is +89° 15′ 50.8″ so it is only 0.746° away from the pole, (where the "+" is in the center of your drawing). 

Since the inner circle's 143 pixel diameter corresponds to 1.472°, the outer circle's 824 pixel diameter is only 8.48°, or 85.76 North declination. The big dipper and Caseopia are at 60° to 50° North declination, way way outside the view of your scope.

They are shown only to provide a general direction to help decide how to rotate your finder.

 Source