I scrounged some 1/4" polycarbonate lexan for windows, and I thought you might like to see a safe way to cut it. The waxed Asian style saw (Vaughan Bear Saw BS250D) cuts it very cleanly and straight, and a handplane will clean it up further. The 66" cut took about 15-20 minutes. I definitely recommend these saws for all kinds of work. They're efficient and give a high quality cut.
Here's the setup: The lexan was placed on two 2x12 planks spaced with a 1/2" gap to saw through. A candle or paste wax lubricated the blade. It was not difficult to split the pencil line.
![Image](http://uploads.tapatalk-cdn.com/20160915/46f085cd32082f358b7a54a79e6d8e2b.jpg)
Here's the sawn edge. You can see that the saw was drawn through the material at a shallow angle of ~25 degrees. This eases the sawing and helps keep the cut straight.
![Image](http://uploads.tapatalk-cdn.com/20160915/50cc857aeabdb03ee61e8e6f93a35d87.jpg)
After shooting it with the handplane, the edge looks like it was done with a jointer or router.
![Image](http://uploads.tapatalk-cdn.com/20160915/9bf7ab484c2c70f427707c3695fb4746.jpg)