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One thing I've wondered is if the Galaxy class could fit in TSFS Spacedock if the door were bigger rather than scaling up the entire structure.
Agree, since this Spacedock is huge, I just thought they enlarged the size of the Spacedock spacedoors to allow the larger classes of starships(Ambassador, Galaxy, Sovereign) inside. All of the NG Starbases that are the same design had the larger spacedoors, these starbases were built between 2285(the era of TOS Movies) to 2363 the era of NG, seventy plus years.
http://memory-alpha.org/wiki/Earth_Spacedock
http://memory-alpha.org/wiki/Starbase_74
http://memory-alpha.org/wiki/Starbase_133