So, if the "passenger emergency exit" was standard on the Electra, we need to remember that Amelia's Electra was not standard. The two possibilities for dealing with the passenger emergency exit, as I see it, are:
1) It was not included at the outset of the construction of her Electra. If so, wouldn't there have to be some kind of drawing or notation or something on how to skin over that rather large opening hwile the aircraft was on the factory floor?
2) The passenger emergency exit was skinned over or otherwise covered during the construction process. That might account for both a) The orderly and evenly spaced lines of No. 3 rivets on the 1-inch pitch, because they could be drilled on some kind of jig on the factory floor, and b) The irregular line of heavier rivets along one edge, since it was a non-standard, one-off modification specifically for Amelia that was probably installed on the fly while the aircraft was still in the construction jig.
If the Windsor Locks Electra had the passenger emergency exit installed when it was built, we might be able to quickly qualify, or disqualify, 2-V-1-1, by going to that same area on the starboard fuselage of the Windsor Locks Electra.
LTM, who still finds paint more fascinating than rivets,
Monty Fowler, TIGHAR No. 2189 ECSP