(I'll forgive you for calling me Chris since I called you Jeff by accident the other day
I'll take some more measurements and detail photos tonight. A couple more thoughts:
The chimney was rebuilt down to the first floor hearths. I was told this for a fact by the previous owners as they had the work done in the past 15 years. I'll take a photo, you can clearly make out the difference in brick from the hearth extension to the firebox, it also has full contemporary clay tile liners and modern dampers in both hearths.
the attic... I wont be able to look at where the main chimney goes through the roof since its all finished. The attic photo I posted is the attic above the ell, which is acessable from a 3/4 height door on the second floor. I will take a photo in there, but as you enter you can see where they cut a hole through the original roof sheathing between 2 rafters to gain access.