First wall!

I decided to buy a bathtub and get that into the bathroom area first so I don't have to worry about dealing with moving it when there's walls in the way:

I wanted each of the studs for the wall to be directly under each of the ceiling joists, so I cut the crown plate to length and clamped it up to the ceiling joists, using strings stapled onto the sides with sawzall blades at the bottom to get it lined up.  Then I marked it:

And measure the stud length:

Then transfer the markings onto the other 2 plates:

And now to nail it all together, going from this side, there's the bottom plate for the bathroom wall to hold it to nail it against:

Since I'm not good enough to do the other side without bracing, I nailed 2 small pieces of wood into the subfloor:

Now to put the door frame in:

For some reason, one of the ceiling joists was a bit lower than the others, so I had to unscrew it to get the wall up...

To get everything aligned, square, plumb, and true, I kept the wall standing with a clamp and used my hammer to tap it into place:

Then I shimmed it on the top and nailed the bottom plate in.  I still need to put in the brackets, so I put a clamp on each end to make sure it doesn't move: