I did something similar (if cruder) in February to find out where my polar axis was pointing.
I took a sequence of images of the NCP region using a (shutterless!) Audine camera with a 135mm lens at f/3.5. The image shows the sum of 10 images taken 20 deg apart in RA.
The brightest stars in the field are Polaris ( dec = +89d 15m 50.56s ) and Lambda UMi ( +89d 02m 15.66s ).
Comparing with CdC, the centre of the circle is at about 15h 05m, +89d 53m 46s ( approx 6 arcmin E of NCP at the time).
