I used to work in a hardware store, now long closed, that sold the screens
seasonally. IIRC the brand we used when a custom size was required was
Portland Willamette http://www.portwill.com/ they have a dealer locator on
their site. I would start there.
Now - why do you need a custom size??? Most screens go in front of the
opening and are made to cover a range of sizes.
The custom ones we did were scribed to the inside of openings. We would make
a cardboard template, cut to fit, then trace that to a luan plywood template
and then trim that up to fit. This was then used as a template to make the
custom door. These were VERY custom doors and prices accordingly IIRC.
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