Take two copper pipe cross sections and insert two pieces of 10-inch-long copper pipe into opposite points of each cross, four pieces altogether.
Connect a copper pipe T-section to the end of each 10-inch piece of pipe. Lay the cross sections with extended pipe arms flat on the work surface, with around 20 inches between them.
Insert a piece of 20-inch-long copper pipe on the open ends of each extended arm cross section; two onto the remaining portions of the cross section, and two between each end of the T-sections on the end of the 10-inch pipe, which will be nine pieces altogether. This will now look like a grid with open ends.
Insert the remaining two T-section pieces onto the ends of the center 20-inch pipe at each end of the rack. Affix the pipe corners onto each corner pipes of the rack.
Connect the remaining four pieces of 10-inch pipe between the T-sections on the ends of the center pipe and the corner pipe. The pot rack is now ready for hanging.
Drill a pilot hole in each corner of the pot rack, sized to fit your screw hooks. Screw in the screw hooks.
Locate the ceiling studs where you want the pot rack to hang, and mark four point on them that mirror the corners of the pot rack. If you don't have exposed ceiling studs, use a stud finder to locate them.
Close the arms of the toggle eyebolts. Drill a pilot hole for the toggle bolts right through the ceiling stud at each corner point marked on the ceiling. Drive the toggle bolts into the pilot holes until you hear a snap, which indicates the arms of the toggles bolts have opened at the back of the studs.
Hang a length of chain from each eye of the toggle eyebolts, then hook the screw hooks of the pot rack onto the chain at the desired hanging height. Trim leftover chain with chain cutters. Hang S-hooks over the pipes for hanging pots from.