In looking at the Bensonwood site after seeing them on TOH and the Build Show, the Unity Wall (Zip exterior sheathing, Ijoist “studs” and cellulose cavity, taped OSB, and then a 2x utility chase) seems interesting.  The Ijoists reduce thermal bridging and they end up with what looks to be a very robust wall.  One of the videos alludes that the floors rest on the “interior” 2x wall that doubles as a utility chase.  If so this would eliminate the tricky insulation origami at the rim joist.  Can anyone confirm or comment on how the floors interface with the exterior walls?