How were the A bodies put together down the assembly line?

How were the A bodies put together down the assembly line? OK what I see when taking any older car apart converting into a stock car body, Drag racer, Street ride etc....... is what appears to be multiple pieces (some large , some small) that must be pushed up into a template or on some kind of fabrication table set up with each piece being spot welded together and set back down on the conveyor belt only to be picked up by the next group which adds their parts / pieces to the car which in turn do exactly what the previous group does and sends the beginning of a car down the line. As it continues down the line it begins to look and become whatever product line is being produced on that production line........................... whether its a truck division or a car division plant.

Were their QC people on these same lines assuring that quality was being put into each car as i have read where these A body cars could have been out of square etc.... to a certain degree and they were still pushed off the assembly line only to have the sheet metal division correct the bad?????? I don't remember how much this old body man had stated how much these cars could be off but it was more than I thought they should.

I am sure they tried to correct these types of problems ASAP but had to find the fault area to correct in the first place. If there are any retired line workers on here this might be interesting to know. Texas Red