Until I get that done, I’ll give you my secret for nearly perfect cuts on stained glass. I use Illustrator (could use Inkscape) to create my pattern or trace a given pattern with individual lines. Then apply a stroke to the lines the exact width of the gap needed between pieces (that should be known but different depending on lead vs copper tape), then do Object > Path > Outline Stroke. That creates filled areas the exact sizes of the glass pieces you need. Use a vinyl cutter to cut out of vinyl, throw away the lines and place the filled pieces on your glass in the desired location. That thin film of vinyl is enough to guide your glass cutter so you can score very close to the shape. Sometimes it doesn’t even need grinding. Leave the vinyl on to guide your grinding, and the end result is nearly perfectly cut glass with less effort.
Good luck!