if I was to cut a windsheild ,I would send it out to a plastic shop, so they could polish the edge, I would not like to be looking at the edge if it was not finished, unless you have the tools to do it right, done it in glass and it did not make me happy, about 40 years ago, just my thought on it.
300 i DT. 2011 28,000 km. just broken in, runs perfect, working on the seat to raise the seat and move the back rest back, will send pictures if I can figure out how to send,