I find my six shower works well, big enough to use with another comfortably and small enough to stay warm. I would most certainly want more storage in a room that large... I do love the look of his and her vanities too.

Agree about storage. Perhaps a 4' x 6' shower, leaving room for a 3'7" wide floor to ceiling cabinet. The vanity will likely be floating and will also have some storage. I want to put my living wall (that is moving from our current house to this house) between the two windows, so I prefer not to have storage there. His and her vanities would be possible if I switch the shower and vanity location as drawn above, but I'm having a hard time picturing a shower immediately on the right as I walk in the bathroom.

The wc nook is large, I could make that a bit smaller and just surrender the space to the hall/kitchen area.

I love your living wall much more than dual vanities!

Do you typically shower alone? I have a 3x5' kohler shower pan and glass doors. It is plenty big for me. I wipe it down daily with micro fiber fluffy towel. I wouldn't want to wipe any more area, lol.

Toilet area. I love having a sink near a toilet. I miss that with my 2 bathroom remodels, even though I have advanced toilet seats on both toilets.

Great suggestions Lilysmom thank you. I won't have a door to the wc. I'm leaning towards a 6' shower and 3'6" linen closet I think, keeping the toilet in the separate area. I might be able to move the door a bit allowing for a slightly bigger vanity, maybe get it to 7', thus allowing for two sinks.

Enduring without the door in the wc the sinks in the vanity will be quite handy and close I think.

What I like is having the sink close enough to reach while on the toilet, lol.

Can we see the bathroom in relation to the rooms surrounding it? That's quite a large bathroom and your shower will be so large it will be chilly inside.