Looks good CP.
As far as holes, it depends on how deep the PVC is into the concrete to assure you have enough length for bond between the concrete and the PVC (you mention you were not sure if you used enough so do not know if there is 2 inches, 4 inches, etc.) I like to drill holes just to be sure as the cement and sand mixture is then sure to seep and be on either side of the small holes. I also like to drill holes-say 2 or 3 in the rest of the PVC just so that water will seep in the entire lengts of the PVC.