a psl or lvl installed correctly won't move. you might need to pocket screw the top on all 4 sides rather than toe nail, but the suckers are rock solid.
you said you were talking about a 6" wall? so a 4x6 psl post - it is a monster! if it is sheathed. and the door hooks to that, then glue the sheathing.
so the posts are a fixed cost in your window opening - that leaves the two openings to work with.
i again mention sliders, as they may offer you an option of filling the whole space (a double hung only opens 50% - so do sliders)
now - think of the "weight" of the posts (weight meaning some sort of perceived strength based on their width
- are you going to have equal weight on the far sides? do you care?
what about the weight between mulled sets?
will you notice if the are not the same - absolutely, it will be annoying if they are close -but could work if they are intentionally large/small.
get the andersen with the half screens.
you said you were talking about a 6" wall? so a 4x6 psl post - it is a monster! if it is sheathed. and the door hooks to that, then glue the sheathing.
so the posts are a fixed cost in your window opening - that leaves the two openings to work with.
i again mention sliders, as they may offer you an option of filling the whole space (a double hung only opens 50% - so do sliders)
now - think of the "weight" of the posts (weight meaning some sort of perceived strength based on their width
- are you going to have equal weight on the far sides? do you care?
what about the weight between mulled sets?
will you notice if the are not the same - absolutely, it will be annoying if they are close -but could work if they are intentionally large/small.
get the andersen with the half screens.