Step 1: List & Tools
TOOLS: scissors, hacksaw, drill, 3/8s drill bit, two items (weights) to keep pvc off carpet/newspaper, and sandpaper.
Clean up: newspaper and a vacuum cleaner.
Step 2: Cut and Mark
Step 3: Drill
Drill the markings straight through PVC( from one side to the other). I propped the pieces between two 25lb weights to drill one continuous hole.
With the rope I found at the local hardware store, I had to drill 3/8s pilot holes( 1/4 and 5/16 holes weren't large enough to feed the 1/4 nylon rope through)
Step 4: Lace Rope + Finish Up
Spiff the cosmetic appearance by adding: end caps, plastic tubing between the PVC, and large rubber O rings.
The three rack pictured was the template for my rack.
Pictured tanks are AL 63 CFs and one 80 CF, all with H valves :D