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I'd say only get it if you like the set. Buying sets just because they're the biggest at that point in time will eat up space slowly but definitively. Then eventually you'll have to make a 'which sets can I bear to part with' thread.
The world map is more problematic as that does exist but with the exception of the frame I am not sure it can be classed as a true build.
It was done in the early 1960s on a truly massive scale... but as a glued display model...