as i near the painting of the car , i want to make sure it is done as per factory , undercoat on metal, paint on undercoat, and undercoat on paint , i'll even re- lead the joint as per original , found some clues hidden in the layer as i was careful stripping it , but i am missing one detail, the floor color / texture / overspray,

I want to do it in the same order as the factory , as it probably done in a certain efficient way

i know the underdash down to the floor level is undercoat
the rear seat and up are body color
the vertical panel below the rear seat was body color with a coat of satin black on top , same as the tunnel and seat bracket mount , the inner door sil was body color
but what about the actual flat portion of the floor , what order , where the overspray

I have found picture of concour car and found 3 different finishes, but what is as factory

thank