The forging process of a Magic Structure wasn't easily accomplished just like how the two made it look like, especially for a structure that approaches the Grade 3 level. A structure that reaches this level wasn't easily appraised even by a licensed Magic Engineer. There are cases like for those original creations that needs to be analyzed by multiple engineers just like how Bryson from NMTI called several more magic engineers to appraise or grade Wallace's Floating Drive System.
So right now, they needed someone not only well-versed in terms of recognizing the Magic Formulas infused, but someone who can also properly gauge the power, usefulness, simplicity to it's difficulty in terms of utilization, method of creation, and destructiveness that the structure can potentially apply to an artifact. After all, those were the main points to determine what Grade of Mana Artifact it should be.