These are still just basic conditions.
To really achieve high-quality visualization, you need outstanding imagination and an extreme proficiency in Origin Structure and Inscription Studies, capable of adapting to situations rather than rigidly applying what you've learned, otherwise, a single anomaly could leave your own brain stuck in a bug.
Not to mention inscribing Essence Structure onto oneself, setting aside the waste of energy, is also like performing surgery on oneself. It's difficult to oversee the whole process, making it very easy to make mistakes.
And then there's the most critical factor: time.
If someone really started constructing their Origin Structure from a nanoscopic level, by the time they finished, they could have killed ten thousand Magical Beasts.
Even if one went fishing, the collective value of their catch might be enough to purchase a portion of Demonic Beast Materials.
The most important point is this.