Seems like the consensus would be 14/15 on the front and the drive side rear, with 15/16 or perhaps even triple butted on the rear non-drive side.
Does that make sense? Once my hubs are delivered, I can start taking measurements and feed them into a spoke length calculator.
Still looking for more additional input on the nipple length. I feel like longer is better, but I don't have any evidence or experience to be definitive about that.