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Buy inch PVC pipe from a standard hardware store, along with 8 T-joint connectors, 4 end caps, and 2 elbow joints, all in the same " size. Get 4 10-foot lengths and use a hacksaw or ask staff at the hardware store to cut the following pieces from them: One 6ft 1/2 PVC Four 3ft 1/2 PVC Five 2.5ft 1/2 PVC Two 2ft 1/2 PVC Four 1ft 1/2 PVC Note that these lengths include enough material to brace the frame with two horizontal pieces and a small vertical piece that connects them. If you use thicker PVC pipe (like " or 1") the frame will be sturdier and you may not need this bracing. Look in any store that sells fabric for a bright green color of natural or synthetic fabric that won't wrinkle easily. Purchase at least 2-3 yards of fabric that is 48 inches wide or wider. Note that a standard width for fabric is 48 inches, or 4 feet. If you want a green screen wider than that, look for fabric that comes in a 54" or 60" width, or sew two pieces of fabric together for an even larger size. It's also a good idea to iron your fabric so that it is free of wrinkles before use as a green screen. Visible wrinkles that show up on camera will interfere with the keying process that replaces the color with another image. If you cannot find a suitable green color of fabric, you may be able to paint or dye fabric to your desired shade. However, this method may not turn out as even or consistent as a pre-dyed fabric. Determine how you would like to attach your green fabric to the top of the frame. Use clamps, sewing, or elastic depending on your preferences. Get A clamps (or spring clamps) to clamp the fabric to the top of the frame. You will also use these to attach the fabric smoothly to the sides of the frame, so you can grab a few more with very little expense from a hardware store. Try sewing a "pocket" into the top of the fabric by folding it over and sewing to create a long loop through which to slide the PVC pipe. Use approximately 6 inch pieces of elastic band fabric, folded over to create loops large enough to fit around your PVC pipe. Then sew or staple these loops to the fabric wherever you want it to connect to your frame.

Summary:
Cut pieces of PVC pipe. Cut and sew fabric. Decide how you will attach the screen.