Got the fuselage top all mounted centred left/right as well as positioned correctly fore/aft. Station J is the only place on the aircraft where the cross members on the top and bottom are aligned vertically. I used this to get the fore/aft aligment.
I have plumb bobs hanging at station P and station J to make sure the fuselage stays centred left/right.
I have levels stting across the top of the fuselage at a couple of locations to keep an eye on that.
The only picture I did take that day was the arch at station M in the jig.