Here's the joint we prepared last week. The bolt sticking out of the top is just a temporary thing, we'll replace it with a piece of rebar cut to the correct length.
We've used a small block of wood to shim up in the centre here because of the taper of the beams. We might chip out a bit from the other ends of the beams so we don't have to have this. It all depends on whether we can get them off the rebars next week. By the time we put these beams on we were so battered by the wind our brains were too rattled for lateral thought.