Downside is that I hosed up a bit. The side window openings are designed for a 46" wide window, but they skipped the 46" width and went to 48". Not a huge deal, it means that I need to add some framing elements for a 42" width instead. It's a PITA, but I'll survive.
Closeup of the window rail construction.
Underside of the window rail.
Sadie hangin' out in the yard.
Bored, bored, bored.