You have thrown some great info at me - thanks! At this point I think I need to find out what varieties my buddy is looking for. I could plant those (if I don't already grow them) and gradually (over 2 or 3 years) work my way up to supplying just his harvest ales (again, we're talking about a brewpub, so not a huge system).
Coincidentally, I had a talk with the hop farmer that lives near me. I was trying to see if they had surplus from their contracts and if I could score a deal for my club. It sounds like they grow enough to supply a (different) micro-brewery for their harvest ale. Potentially a great opportunity for an Oast Coop.