Once the production goes beyond 4-5 frames wont they need more space in station 59? And they only have capacity of two planes in station 50 at any one time currently?
The A350s will simply move quicker through the stations. Fuselage join in S50 will go down from a week to several days. I also believe work force will be increased. Think about 3 instead of 2 working shifts (3x 8 working hours = 24 hours work per day).
And early next year a 4th S40 and 4th S30 will open.