In any case, Andy is applying some caulk around the window frame, sealing the pieces of foam together to keep the air sealed away from the concrete. Air holds moisture and allows condensation to form on cold surfaces. Since we have insulated the interior wall of the basement, we need to keep it protected from that air and inevitable moisture.
This is the craft room window, and through it you can see the mess under the vestibule. Fuel cans, the generators, Andy's motorcycle, 3 sets of summer tires, and various other 'garagy' things are stacked and stored there, yearning to be used.
This is the window frame we built. We used left over pieces of 2x6 flooring to make the frame. The tongues and grooves were ripped off (on the table saw, not with pliers), we screwed the frames together, and used the pocket jig to drill the mounting holes that screw our frame into the existing window frame. It is solid, and we can finish the wall with sheathing now. The window sill is 9" deep as measured from the outer lip to the glass. You can also see the dryer vent installed next to the beam on the left. That was new this week, and nobody misses the way the pipe used to stick out of the window.