The metal storm door to my house is a severely non-standard size, and
since a replacement'd be needlessly expensive, it occurred to me that
I'd be better off making my own design with wood-- I'm thinking a basic
rectangle with Art Nouveau designs in the middle.

So I'd like to ask some advice here. Oak would be the simplest and
cheapest choice, but would it be worth my using cedar something else
suited for exterior work? (The door is under a wide porch, so very
little rain hits it. Some sunlight hits it directly.) Is there a
recommended method of mounting windows or screens in the door? Any cool
designs you can link me to?