Originally Posted by Karri_R

I went and did what mr. 66 said. Tubes are align to my eye, but I found out something else.

The chainstays are only tubes with lugged joints. All other tubes are welded. Crank-side lug is farther from the side of the BB. Maybe because of chainring clearance? Chainstays are not dimpled. Left-side lug starts from the edge of the BB. The difference is max. 1.5 mm.

I will try to align rear triangle couple of millimeter to left and share the outcome after that.