Another great tool that I'm so lucky to own is a strip cutter.
Its a glass cutter with a ruler and a base combined together. The cutter can be set to increments on the ruler depending on the width of glass desired. The base rides on a surface higher than my cutting surface and scores the glass in a nice even line.
Then the glass pieces are broke apart from each other. Next, I'll need to fit the border pieces to the original design. I've chosen to have a 1" border in the same pale green color that is in the body of the panel but in a different texture. The border texture is called rough rolled and it is translucent with a slightly rippled texture. For the corners I've decided to use 1" square clear glass bevels.
In the next few days I'll go to the next step in this project--foiling the glass pieces.
Shown: strip cutter, fitting the border to the body of the panel.