One possibility would be to swap the living room and the dining room. Since the current living room is larger than the current dining room you could still keep some comfortable seating (couch and upholstered chairs?) against the front wall for a keeping room/dining concept. Then your new dining areas (kitchen and dining room) and living areas (living and drawing room) would have good flow between them, which would work well both for family and entertaining. You could also add some builtin bookshelves in the drawing room or new living room to create a library area to add another fun element to the living areas. These bookshelves could be against the long walls in the drawing room, around the window with a window seat in the living room (former dining room), or built to create some separation in the open area between the drawing room and living room/stair area. Your plan seems to show some sort of builtin there, but I'm not sure what it is.

I see a long narrow space with several doors, windows and white furniture. I don't understand the furniture grouping of the sectional and then a lone sofa? The room lacks height (vertical interest). I like this idea: the back wall totally painted a charcoal accent color (including the door) and then, white pottery as an accent. Painting your wall will help shorten the room and make it appear less long and narrow. Leave other doors white. I also like the art in the photo and a few touches of red to give the room a bit of color. I'd have something like the shelving in photo #1, it's less busy than the boxes and easier to keep clean.

The butterfly drawers would be sturdy enough for grains and cans. I would just make sure the drawer glides are able to hold the weight. I usually look for Blum hinges and glides, they've usually held the best for prior projects. Lazy susans are usually what I love to use for corner storage. However Lazy Susans with a center pole usually cut down on storage space and can be cumbersome when trying to get items in and out. I love the ones that are mounted to a fixed shelf with no center pole. If something falls off it's just like reaching in the back of the cabinet shelf. Plus with the fixed shelf your able to store heavier items like mixers, pots and pan. Magic Corners I find to be awkward when trying to store items, and most you can usually just fit smaller items in the compartments. And the one complaint I get from them is that the glides get sticky over time. If your still wondering what options to go with, find a local kitchen showroom and try them out. Open all the options your looking at and see what fits your lifestyle and habits.

For the living room, the focus should be the balcony area. So flipping the couch to face the wall and not the dining table will help. Kind of like this pic. Even if you already have the sectional that is in the diagram, you should be able to flip it. In fact a sectional would probably work better than the couch in this pic. I also really don't like the style of this pic, but it showed what I meant, For the girls' room: No matter which bedroom you choose, you should maximize floor space so that they have the biggest play space possible in their room (as they get older you can add desks for school work and such). To get this space, I would give them bunk beds. This configuration gives them an open feel and more storage, essential for girls. You posted two different kitchen designs. This makes it hard to give you advice. I agree with other posts that your sink should be away from the wall. This allows you to have stuff to the left of you (drying dishes in my house), while you wash vegetables on the right of the sink. You need the same space on both sides of the stove, also. At least 24 inches on both sides is good. 36 is better, though. The first design has a nice little countertop space that adds a place for your daughters a space to sit a watch/ talk to you while you're in the kitchen. When they added this to the first design, you lost cabinets on the other wall. This is bad, as the space is already storage limited. Try making the rounded countertop bump out into the living space more. If you play with the shape, you could make it work without losing the cabinets on the other side. It doesn't have to be rectangular or a perfect circle. You can see how this one isn't confined to the floor plan of the kitchen. I think this is what you would need to do to make it the most functional.