I'm not sure where that door came from. Our company provided the plans. I know there are a number of companies out there that make new doors that look old. There are also sources for similar salvaged doors. Architectural Accents in Atlanta has a huge selection of salvaged doors - including quality screen doors of varying sizes: http://www.architecturalaccents.com/
Randall Brothers is also based in the Atlanta area and they have a variety of new screen doors: http://www.randallbrothers.com/PDF/Wood%20Stock%20Screen%20Doors.PDF
I haven't seen any of this company's doors in person, but they look well-made from the website: http://www.vintagedoors.com/

I think the main things to look for in a quality screen door are the thickness of the wood and the way the pieces are joined. The thin and flimsy screen doors from the home improvement stores just aren't going to give you years of life that a solid, well-made door will. Sorry I couldn't be more help. Good luck!