Thank you for taking the time to make these diagrams, capturing your creation on photos and posting the principles. Am I right in understanding that a 3/4 inch PVC pipe is in each hole of the 2 x 6? Then 3/4 inch couplings are then stuck to both the top end and bottom end on each pipe (one on left and one on the right)? I will attempt to recreate what you have shared this weekend.