The easiest way to make STB's is to take an old super, set your table saw fence to 2" from the blade, cut the old superall the way around so that it is now a 2" tall super. Reset the fence to 1". Clamp a stop board to the front of the table saw so that the you can cut a 1/8 slot through the side of the 2" super safely. raise the blade up about 1" above the table. Then slowly and carefully push the super down onto the blade. A few inches through to the inside is all you need on at least 2 sides.
Then staple the screen on one side. Add a 3/8" by 3/4" (the width of the super board) on top of the screen, nailed down all the way around.
If you want, you can add a feeder by adding a 3/8" x 5" x 6" piece of scrap plywood in one corner before you place the 3/8" x3/4" strips. Drill a hole in the plywood that matches the size of your quart jar lids. I think the standard mason jar lid is 2 1/4". Be sure to align the hole so that the jar fits inside of the super. Then you just add a shallow super on top of the STB and the cover goes over it. Do not use the inner cover with this setup. If you are not feeding, just place a jar lid in the hole.
During the winter, I add a piece of foil backed foam insulation placed directly on top of the screen to keep in/reflect the heat.
Good luck and be careful cutting with the table saw.
Use an older carbide blade and move very slowly to cut the nails. I usually adjust the blade one way or the other to just miss the nails. You can also just build a 2" super which is what I do most of the time. If you cut a deep to make a medium using this technique you end up the the material you need.
Jim