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this is the best/easiest way for you.
ive done the drilling through the top too and there is not much difference and alot more work. Just get your one or two pieces of pvc (if a double barrel) i usually tape my together so they stay good while i screw into them from the wood.
Just put the wood your using over the pvc then being to drill into the wood into the pvc. It usually doesnt do in flush the first time so once you hit the pvc and the wood lifts a bit just back off the screw then screw it in again. Depending on the size of the rail im not sure how many screws youll need in each rail, but try to have a pretty good amount. (5 for 10 ft?)
Then just screw on an angle into the supports or legs