Just throwing this out there: is it possible to move the pwdr room and stacking w/d onto the bottom wall in that area? So, when you entered the doorway to that space, on your left you'd have: stacked w/d (maybe with bi-fold doors if you wanted), then the little pwdr room. You could then have a bigger closet on the other side and an L shaped bench around and under the window. Like this:

no clue if this would fit, but it seems like it could, depending on what you wanted for a BR sink and if stacking w/d would work for you.

I like it Deedles. Thank you. I had actually been trying to figure out a way to get more bench space and to have the bench be an "L".
Is the powder room too tiny though? I think it will be about 36"x 77". I noticed that you just revealed a lovely little powder room. Do you mind me asking its dimensions?
Another concern I have is the venting of the dryer. In the original drawings I would pull the sink forward to create a box for the vent pipe and use the other space as storage. If I go with the way you have it drawn I guess I would bring the vent pipe up to the ceiling and box it in.

Shamelessly bumping my own thread to see if anyone else has ideas.

As part of our kitchen remodel we have a closet for a stackable laundry. We don't have a W or D in it yet but I think DH vented it down not up. It goes into the crawlspace and then to an exterior wall. I don't know if that helps at all.

Unless you need a big sink for some reason the sink in the powder room could be pretty small. I'm think of some wall mounted ones I've seen that fit it small spaces.

The powder room we did measures 35" x 72". Plenty of room, don't feel cramped at all. If you went with just a wall mount sink like debrak says, you could even shorten it up and give a bit more to the w/d if you need to.