One issue I have noticed with the Rundschau system of this era is that the shoulder seam is a tiny bit slanted backwards on the bias. This is likely a relic from older version of the system, in which the seam was even more on the bias. I find it best to complete the pattern according to the above system, and then advance the back shoulder seam forward by 1.5-2cm or until it runs down the middle of the shoulder. The back neck will also have to be widened by 1-1.5cm (and the collar seam of foreparts reduced by the corresponding amount).As it stands the above Rundschau draft will give you an approximately 7.8cm back neck, which is similar to the 3" back neck found in Edwardian era Cutter's Practical Guide systems. The modern back neck is typically wider than the narrower back neck of the 1950-60s, and results in a cleaner shoulder, as well as more forward pitch of the shoulder-armscye.