|Worried a good bit about this corner prior to attempting it.|
The interior sills are extra deep to cover the thick walls insulating the concrete foundation, and to provide a place for plants, objects, etc..
More pics below.
|Turned down edge to cover the end grain. Wide vertical piece at the column between the doors and the windows.|
|Don't you even|
The window casings on these large windows do bow a bit, so the alignment with the sills goes from zero at some points to 1/8".