You guys are making life difficult for yourselves. Sticking patterns on the glass and all that is a waste of time.
Make a pattern out of file folder manila, cut it all apart with a pattern scissors. I DO protect my cartoon with shelf paper, but not the patterns.
Trace around each piece of the pattern onto the glass with a Sharpie. Don't use one of those hair-line fine point ones. Use one that makes a mark about
1/16 to 3/32" wide. If you have dark glass where the Sharpie won't show up, use a paint pencil. (Gold or Silver, in the crafts dept at your local Walmart.)
Cut your glass so that the black line of the Sharpie is left on the scrap side of your cut. Your desired piece shouldn't have any Sharpie ink on it at all...if your pattern was to size, then the black line was traced outside the pattern. If you leave the line on the scrap, your finished piece will be the same size as your pattern.
Now, take the glass that is cut to the pattern and wipe it around the grinder one time to get a matte finish edge (or to remove the Sharpie line you couldn't bring yourself to leave on the scrap.) ;