I already have the windows. I just need to cut one of them down now that some vents were added.I had these guys custom cut some parts for me. Pretty reasonable and fast.
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A router with a flush cut bit would be my choice, but feed and speed are critical.
You would have to rough cut then run a trial with 1/16 -1/8 left for final cut.
When I machined some thick 1” polycarbonate I couldn’t get that frost edge finished out to a gloss, and one of the senior gentleman showed me how to use the hot air of a cutting torch to “ flame polish “ the machine finished area.
A heat gun would be a better option depending on the starting finish your edge.
My pennies worth
There are YouTube videos….some better than others. The key is a good machine finish.Interesting, very interesting. I've never heard of this process, I'm intrigued by the process to seek information about it. I know edges can be sanded working up the grits and then polished out but, that's a pretty lengthy process. What you posted seems like a much faster process once learned.
score your cut with an awl, a utility knife, or a scriber and you don't need to worry--the blade will follow the score for the most part if your feed is slow and your eyesight is good. I just take a piece of 1/8" hardboard run it in the blade and make a table cover to use with plastics. A couple of pieces of double-sided tape on the bottom and that's it. Some strips of 2" masking tape on the bottom of the plastic and that's all the protection I use.I'd love to use my band saw but its a relatively long cut and it makes me nervous.