I added two more cross bars to each main trellis support and then criss-crossed the hop twine to the top. This provides about 14 feet of twine for the bines to grow on until they reach the top. At that point, I'll either need to pinch off the top of the bine or come up with some other workaround for extending the twine. The Cascade plant in the photo is already happily growing along the twine and has reach the first bend.
I also installed the drip irrigation system, but I still need to adjust the flow rate before I turn it on. I also need to buy some new and add a fresh layer to the top of the pots.