Dave, that is only maybe one tenth of the assembly line.
What makes it unique is that is shows 3 of the newest configurations of the 737 in build.
Normally the “latest” version will dominat, a build line, but this platform is so diverse, it allows the customer to choose the exact aircraft that will fit its needs.
Only Boeing does this, from avionics, cabin configuration, to bathroom fixtures, etc. and the line (build) doesn’t stop.
That plane moves every day, from wing/body join, out the door, paint, then to customer, at about 40 planes a month clip.
That is dialed in, eh buddy