Hi there thanks for the interest, this build has been sitting for a bit due to work commitments and another hard tail build.
Here it is in its latest stage with a Sturmey Archer 3 speed fat bike hub and 3.5" tire. I have spread the dropouts to 170mm to accommodate the IGH. This now makes an almost perfect chain line where I was having chain issues with the 135mm nuvinci 171. I haven't had time to test this setup yet.
What I have discovered during this build is that as cool of a setup as it is, it's too big for me, I feel like a little kid on a giant bike. I'm coming to terms with parting ways with it.