Multiple sets of plans, at least in today's world, are not unusual.  Having
worked on several complex engineering projects, we usally had at least three
sets:  the proposal set, the actual design and build set, and the "as is" or "as
built" set.  Often with subscontracting that involved adddiltional sets.  So
don't knock the museums for multiple sets.  They did the best they could.
Yours for fun flying -- Buck Buchanan

 
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