Gents,
Seriously, IDEAL X cannot be considered a containership. It was an oil tanker with a spar deck to transport some containers. She never qualified as a cellular containership, as it was still experimental.
It is like comparing a space shuttle to the Wright Brothers when it comes to space exploration...
At least a purpose-built first generation containership would have been an (easy) target :-) as shown when comparing to AMERICAN LANCER...
Best regards,
Herbert