The loft joists and collar ties are up. We had a minor setback here. The wall structures were not very stiff and the loft areas were unstable places to be. I couldn't stand up holding the ridge board structure without mortal fear. So, we returned the next trip with full flooring for the big loft and 1x4x8 "strips" to diagonally brace the walls.

The rafters up are up! We don't have any in-progress photos for this step because we forget the camera. You can see the diagonal bracing we added to stiffen things up temporarily.

You can (hopefully) see the big loft is sheathed along with some blocking to keep things square and stiff.