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You know the only reason why RAW seeing the sun doesn't work is because nobody bothered to make size rules past colossal size. I was having similar problems just now because I've been trying to find out exactly how big the Tarrasque is to solidify some house rules. Personally I think once it's past double 64-128ft then the monster should have some environmental rules so that you can interact with it as if it were not a creature sometimes (climb it like in Shadow of the Colossus.)
The Tarrasque can swallow a Brachiosaurus whole (gargantuan size) if that helps you judge its size.
Shadow of the Colossus has almost nothing that reaches 100' in height, so climbing something like that is probably best left as a feat rather than a monster's quality.