I do not know if this is correct according to B&C, but I would measure it as shown below.
Just to clarify, I would consider this to be a main frame 4 point with a kicker. So the point I numbered 1 would actually be the second point, after the brow tine. Then I would measure the next regular point and come back and measure the one I numbered 2 as an extra point. Circumference measurements would be taken at the base, after the brow tine, after the fork, and finally between the last regular point and the tip of the main beam. These measurements would be added to the length of the main beam for the gross total.
Again, I do not know if a B&C scorer would agree. I think common base tines have been controversial for them in the past. My basic philosophy's are, "nets are for fishing" and "when in doubt, count it".
Nice shed bu the way.