I read a bunch of different window cutting tutorials, but when I did mine, I went with this easy way...
Use a jigsaw with a metal-cutting blade to cut the shape of the window in your panel (use masking tape to protect the surface).
Next, line the edges of your window using auto door molding available at every auto parts store (comes in lots of colors, including chrome, gold). One strip probably won't go all the way around, so use two, and cut each one to cover half the hole. You really won't notice the seam.
Next, cut your plastic (you can use the jigsaw if you go slowly & lubricate with dish soap) -- or just score it and snap it to a size slightly larger than your window.
Grab some double-sided sticky foam tape, and line the inside of your window with it.
Press your plexi to the inside, and voila! It's done.
The 3M foam tape stuff is really strong, and it will hold, believe it or not.
If you want a fan connected to the window, you might want to attach the window with screws or rivets instead, but you may not need to.
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