Install the lower header with joist hangers figure a and assemble the front wall on the attic floor.
Framing out an attic.
Framing out an attic question.
Shim under the bottom plate to level it if necessary then nail it into the floor joists with 16d nails.
Collar ties are horizontal members that like rafter ties extend from rafter to rafter but.
Run the plywood down to the top of the knee wall.
This is the full view of the attic.
Use screws to attach sheets of birch plywood to the angled ceiling over the insulation making sure to drive the screws into the ceiling joists.
If you want your attic space to have a flat ceiling you ll need to add collar ties to the framing.
The plywood will create a smooth strong ceiling without having to apply drywall tape and mud to the ceiling.