If you add a little Tyvek to the second floor, this is pretty much what the house looks like right now.
They had to extend the chimney and the two fireplace liners above the new second floor. We were really tempted to start the fire the other day (it was 51 degrees in the morning! After 97+ days, that felt really cold! BUT we didn't - I don't know if we have to get an inspection on the chimney...)
Here's a shot of our newly installed stairs - the lake is at your back, and at the top of the staircase there's a landing and you turn 180 degrees. When you enter the sitting room on the 2nd floor, you're facing the lake, with a view to die for! Also, you can see that 2"x4" supporting the landing - picture a wall alongside the stairs where it's started to get framed out, making a right angle to the 2"x4", then another right angle to the front of the house. The left window will remain visible, but there will be a door there to enter the lower staircase, to access the basement. Those stairs will go from front to back, into the basement, coming out facing the walk out door to the lake.
From the sitting room, this is one side of our double-sided-fireplace-to-be; the other side will be in our bedroom.
Here are our new sliding glass doors and windows in the living room, with all the grids finally installed!

Since I can't figure out how to add more than 5 pictures at a time (I don't think I can), I'm making two separate entries this morning, to catch you all up to date on the construction.