But what about American battleships?
They were supposed to go to NARA. After a dozen FOIA requests, I can report that the original plans for BB-34-BB-66 were sent to the US Naval Historical Warehouse in Memphis TN. That warehouse was closed and it appears the blueprints were destroyed.
In all my travels, I have never seen an original plan, only blueprint copies.
A full set of Iowa class blueprints was sent to the Philadelphia Naval Yard (300 boxes). A source there told me they were placed on the USS Charleston along with all the spare parts for the Iowas.
The USS Charleston is still at PNY awaiting scrapping. Which means the last complete set of Iowa blueprints will likely be destroyed.