The problem is, as I'm not sure which font will be used yet, I want to be able to just change the font for the source text layers ONCE and the shine adjusts consequently for the changed text.
By @Marc Skywalker
The problem that I see is that while the size of the typeface is the size of the metal block as defined by Gutenberg, they vary widely in x-height, ascenders, counters, and descenders as well as that the width varies from Narrow to Extra Wide. Tracking and kerning will also affect things.
You might consider creating the shine, but adjusting the mask as needed until you settle on a typeface. Your work will be easier if you make a final decision on the typeface first.
Jane
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