Today I unwrapped the backer glass, put it in place over the pattern on my work table, and started cutting pieces of glass from the far right side of the pattern.
I don’t have a piece of medium gray glass that is long enough to make some of the pieces of the pattern. I will likely deal with that by abutting two pieces of the glass as closely as possible.
I will be cutting the glass from only the white parts of the pattern (the orange cutting lines will be removed) so there will be a slight space between the pieces.
Something I didn’t anticipate and have yet to encounter before today is that some of my art glass really is not flat. That will likely cause bubbles in the resin underneath the pieces even if I glue them in place. A thicker layer of glue really isn’t good (to fill in the gap) because it can be visible from the back side of the piece, so I will have to think about this issue.