I don't know how fine Jayce's work would be for the second option I described, but he might be able to direct you correctly if you ask.

[He offers the sketchbook back, the page of his notes done and fairly sure that he has described everything appropriately and without there being too much confusion.]

You'd want to practice the combination of sigils on metal as well before you commit to making the thing, just to ensure that there's no errors or unforeseen issues.