Dremel with reinforced cut off wheel or hacksaw
Slip another 48" pipe into the other 3-way outlet, making sure the bolt comes out the other end. Slide a washer onto the bolt and screw on a wing nut. Slide the 3-way outlet onto the 18" pipe. Pay no attention to the 12" on the graphic. This makes the top of the frame.
Slide 2" pipes into the end caps. Slide 4-way tees onto the 2" pipes. Slide 22" pipes into the tees. Pay no attention to the 20" on the graphic. This is the front of the frame.