Yes, I mark the desired window on both back and belly, then stand behind the saw and pull the bow to me. Only cut to line on first side, then turn bow around and cut from other side to keep cutting from glass into wood so it doesn't rip glass off the bow.
I'm not advising doing it this way, just saying it's how I do it.
Use an old carbide blade with more teeth than my usual 24 tooth for ripping woods.