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Recently I have been working on as series of Tillman Battleships that take into account the New Panamax, not the old one. This led me to a simple question: how big could the locks possible be on the panama canal? Is it possible for an early expansion of the canal or is it more feasible for the initial locks to be built to a larger scale?

Ive had in mind a 'fortress america' ASB/very early POD story where Panama is a US state and has more ability to come into the region and build the locks earlier, but fails the first time. Then the second time, the locks are built to a much more massive scale.

For reference, the first canal locks were 1000' long and 110' wide. New Panamax OTL is 1400' long and 180' wide.
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