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And another note. "The Pensieve was enchanted to recreate memories so that they become re-liveable, taking every detail stored in the subconscious and recreating it faithfully" Straight from the wiki, it states that it takes all details from the subconscious, not the conscious mind. So, having a perfect memory isn't needed. I.e no need for some made up mind castle.
A photographic memory? You're making a lot of conjectures based on nothing stated by J.K or seen in any of the books or movies. Just reaching and grasping at concepts never even mentioned in the books. The mind arts are talked about so little as is, little own a mind palace.
Hmm. I'm seeing a lot of fannon ideas and no canon facts. Little own a way and path for him to do so.