You'll need a piece of wood, you can see I used the back from the bronze trophy I made the other feeder out of, however you could cut a custom shape out of poplar, or use an old window or picture frame. Also you'll need to cut some wood splines, some window screening, finish, glue, chain, screw eyes, etc, etc.
Step 2: Trace around and cut out the center of the piece of wood you'll be using
After you cut out the center, flip the wood over and cut a slot for the spline, you'll need a router and a straight bit
Step 3: Here I've cut the spline groove
I've also sanded off the crusty old finish, yep looks like that is solid mahogany I'm working with. Also here's a pic of my router jig.
Step 4: I kinda got ahead of the pictures here
What I've done is cut some square splines from clear pine, the spline channel was 1/4", the splines are 7/32", I draped a piece of window screen over the frame and then hammered home the spline with a rubber mallet. Finally i trimmed the screen and wicked in some superglue to secure the splines.
Step 5: And lastly
A few coats of Spar Urethane, add screw eyes and some chain and you have a complete birdfeeder, just hang outside and add a handful of safflower seed.