Framing the uneven wall

I had to tweak the framing for the dividing wall as it was flush with the concrete foundation wall. I wanted to install insulation around the foundation, so I pushed out the wall 1-1/2" overall. That entailed using 2x2 studs against the concrete wall and specially cut 2x4s to push out the rest of the wall.

Here's a look at all of the work together - a 2x2 base plate added, a 2x2 top plate, 2x2 studs against the concrete walls with the foam installed against the concrete, and the 2x4 studs added to the existing wall.

from top...

to bottom.

Here's a closer look at the 2x4 studs I had to cut to sit flush against the beam in the existing wall. I used a 4 foot long level to make sure everything was all straight up and down. I used plenty of shims to keep studs level and when nailing into the floor joists above too.

I used my table saw and jigsaw to cut out the notches.