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There is only one line shared for S/X as well. My guess is that it's not so much one linear line and that there are stations in the line where 2 or more cars are being built in parallel for slower processes so that the rest of the line doesn't have to show down to the level of slowest process. I could certainly be wrong about that though.
I would split after paint and never come back together. Mostly to keep the material feed manageable and avoid internal material handling. The idea is the robot picks from a truck and somehow you have to get rid of the old pallet and put a new one in.