Step 5: Drill holes in the wood
Mark the locations of each piece : Thinking back to that earlier planing, mark a line to indicate where the center of each hole (and ergo pole) will be. For us, this was at 4, 12, 20, 28, 36 and 44 inches. Then use the first measured one as a template, and copy these locations to the other wood.
Drill the holes : carefully drill the holes at the intersections of the middle lines and the pipe-location lines. Do this for all wooden pieces.