Following on in The Loft Series after the stuctural floor are the walls
these are best constructed within the roofspace where the floor provides a safe large working platform for fabrication
The walls are designed to enclose the loft and to support the rafters & roof.
Cut collar ties that previously passed through the loft will need to be trimmed & attached to these walls. Brace and fix the wall framing to the existing structure ready for lining.
Other posts in this loft series:
Hope you find these links useful
Also please check out Bunnings DIY advice Here
G'day @BIM_Engineer Chris, is there any way that you can post higher definition diagrams of your plans, more specifically, the exploded detail images? Maybe it's just me, but I can't make much out of it in the current format, & enlarging a "View Image", just makes it blurry?