A few notes:
In theory, the powder room / pantry / butler's pantry could all be used for kitchen space (or moved to the other end, compressed or expanded), so I left them in the floor plan.
The mud room will have a lot of windows, so I left that in, since we don't want to obscure the view in that direction. The north wall faces a condo building ten feet away, so those windows aren't so useful.
The south wall is probably going to be one foot further north than it's shown in that drawing; we decided that we'd rather have a bit more space for the family room below, and we can fit one foot pantry cabinets on that wall on either side of opening. That should still maintain the line of sight along the south wall of the kitchen to the mudroom glass-fronted door and adjacent windows (important because it comes all the way from the front of the house and will pull a lot of light through the house).
How would you lay out the kitchen to keep the fridge/range/sink near each other and maintain good flow throughout? Would you include an island? Is there room for one? Do we need some kind of snack 'station'? What else do you need with kids that we aren't thinking of now? Etc. and so on...