BOLD #1: What I did for mine was measure the placement of the screws for the thin wooden frame lining the inside of the screen area and transferred those measurements to the paper film on one side of the acrylic screen insert.
I then Dremeled out recesses in the acrylic to fit the magnets – being careful not to drill all the way through, or chip or crack the acrylic – removed the protective paper film from both sides and put a few drops of cyanoacrylate in the recesses and put the magnets in place:
After letting it sit for a while the glue holds the magnets pretty well, making it easy to remove the screen insert as needed. You’ll notice the drilled recesses show through the front a bit, but the blue screen border will cover that up so it’s not a concern.
BOLD #2: Yes, exactly. If using @tosgraphics’ screen graphics, then you would be correct in that you can’t put the blue trim on the screen insert. Unless, of course, you plan on doing what I am which is attach them to a very thin sheet of styrene and attach magnets to the back of each to make them interchangeable.
EDIT: Ah, @rel571996 just beat me to it! lol
I totally forgot, I need to get me some of these! lol