After a couple of hours of looking at what Lowes had to offer I chose these.
50 ft of 3/4 inch schedule 40 sprinkler pipe, 20-3/4 "T" connectors, 8-3/4 pipe to 1/2 threaded connectors, 8 special adapters called "Universal" for disassembly, and the corners are 3/4 90 degree angle with the 1/2 threaded offset X 8, to give the roof rackyour choice of height.
Total cost 45.00.
Step 1: Measure as you go
Step 2: You won't dent your roof
Do not glue anything until you have the base finished with all of fittings you will need.
Then you can stretch it to the contour of your roof after it has dried.
Once stretched to contour your car you can measure from each fitting to set the height of
the rack. Make it to your specification at this point.
Most important, leave the middle of the roof out of it, so it doesn't dent under load.
Pay close attention to these two "T" connectors. This was the best idea for doing this
project of all. By gluing them at less than a 90 degree angle to eachother when it's dry,
will bend the pipe that goes across the car on the bottom of the rack over your roof,
and not push it in.
Step 3: A nice technique I disovered in process
will bend the pipe that goes across the roof of the car when the top of the rack is finished.
Step 4: Disassembleable
to be disassembled by threaded couplers and stored inside the vehicle so you have a roof rack
when you come back.