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Being in commercial aircraft assembly industry ... there is a build schedule that the IE people keep track of. There are team leaders on the floor that help coordinate via computer and occasional drawings each line unit as to it's build characteristics. There are PCA's (parts control area) that supply packages of parts per build number and date of build to each individual assembly area throughout the plant. It's pretty hard to not build the right configuration as these packages are line unit specific. Workers just don't have pick and choose parts laying around to deal with. If there is a part shortage or scrap ... lots of paperwork has to be filled out to retrieve the correct part. You cannot just show up at a parts depot and ask for an extra part. Each line mechanic has a given number of jobs to do ... each one not necessarily on every unit ... new hires are shown by seasoned workers their jobs and how to get them done in a given time frame. You do the same thing on so many line units no matter the build configuration ... it becomes robotic. What gets messed up or unfinished is mostly (not always) done by some of the better mechanics out of position which is costly and harder to do as the unit has moved on up the line where needed tools and jigs are far behind assembling another line unit in the firing order. I'd guess RV's are assembled kinda sorta like that.
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