I have to chime in on this since I do in fact repair and fabricate screen and windows frames.
Both Marq and Toyln are correct.
But I don't have the luxury of my store providing me with the "proper" tools. For the past seven years I've used an ordinary stiff back saw and miter box (I do not use hack saw). The same one. Never needed to replace it. It works and just a quick swipe of a file remove any burrs. At this point I would not even want anything else. Save yourself some money.
Suggestions:
If the screens are all the same size, make one single template and use that as your guide to make all the others.
Use a 45 degree corner if possible . They are a much stronger frame.
Do not pull tight on the opposite ends. Just keep the cloth firm. A little bit of slack is actually good. You do not want any twist in a finished screen.
Avoid using aluminum if possible. Fiberglass cloth is best and cheaper. Or pet safe if need be.
If the screens are 48 inches or longer you might want to use a midsection stiffener bar.
Try to use a spline that is slightly thicker than recommended. Stretch it to make it fit.
SWISCO.COM is a good source for supplies.
Good luck.
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