I've been asked a few questions about the build, so I thought I'd post the details of the construction & painting here.
The dimensions of the door overall: 14 1/8" wide, 16 3/16" tall, and 1" thick. The frame is 1 3/8"-wide all around, 1/2" deep, glued on a 1/2"-thick plywood backboard. The sign has a 1/8"-thick hardboard behind it to bring it forward a bit.
The frame is built of smooth pine, so I made faux raised grain by running a rounded point repeatedly along the pieces of wood. I also distressed the edges and corners.
I used two coats of paint on the frame -- a really bright blue/turquoise matte tinted primer, and a matte cobalt blue top coat. The cobalt blue is rubbed off with a dry cloth as soon as it is applied. Once dry, I rubbed graphite powder into a piece of cardboard, and rubbed it flat against the raised grain.
To darken certain areas further, I used black tempera pigment powder applied dry with a paintbrush, then blown out, then rubbed with a damp cloth to get what remains to merge with the finish.
All was then sealed with a matte clear coat.
The sign itself was weathered strictly with paint, no actual damage was done to the surface. A very light application of Testors detail enhancer applied with a rag, scrubbed with a soft nylon brush to remove all but traces, and then several dark shades of tempera pigment powder dusted on that while it's still drying, and then rubbed down with a cloth.
The hinges are set into recesses made with a chisel, screwed shut, and painted & distressed. All the screws are given a bit of age, too.
Let me know if you have any questions!