I think considering yourself as a consciousness inhabiting a body, maybe in a way similar to the aliens in The War of the Worlds, is a false premise. Consciousness is one control system, but there are many, and your mind relies not just on the brain but the entire body.

So when you say being aware of every detail of your design, that hinges on awareness in the realm of critical thinking - but all the while, parts of your body are absolutely aware and in control of every little detail. I'd even say, these "subsystems" send a notification to your consciousness if anything is outside normal operational parameters, which makes total sense: Surfacing only details that require immediate attention is a good strategy to control complex systems, and one that we apply to many superficial constructions as well.

Another fun aspect of this is that when you try to suffocate yourself by holding your breath for too long, you'll pass out. Why does that happen? Because your body switches off your rogue consciousness in an attempt to stay alive - because staying alive overrules your subjective experience.