Create a U-shaped frame by inserting three 12-inch PVC pipes into the four PVC elbow joints. This should result in two long pipes on each side, and a pipe going across the bottom, with a gap at the top. Apply PVC glue to the ends before connecting the pieces, if desired, to strengthen the joins.
Connect the two 5-inch pipes to the T connector on both sides of the T. Connect the two ends of the exposed pipes to the open elbow joints at the top of your U-shaped frame. Make sure the T connector is at the bottom of the frame.
Attach half of the hook-and-loop fastener strips to each side of your diffuser frame. Do this by removing the backing and sticking the halves in place.
Align the other hook-and-loop fastener strips onto the vinyl shower curtain directly flush with the hook and loop fastener strips on the frame. Then attach the vinyl shower curtain to the frame.
Insert the last PVC pipe into the open end of the T connector. Use the open end of the PVC pipe to connect the frame to a light stand.