I'd really keep the corner pantry as a closet -- Much more usable shelf space, and a significant cost savings over a cabinetry version. (Doesn't hurt to ask your builder though, since if your cabinets are site-built, that might not be true.) If possible, have adjustable-height shelves on ALL of the available wall space, even though some would be narrow. In a pantry, even 6" deep shelves are VERY useful. For your pantry doors, I'd go with two narrow 'French doors' rather than the larger single. It's more gracious, more interesting, and IMO, a bit more practical since it won't block aisles. The fridge aisle has been covered -- necessary change. Either shring the aisle or scoot the island into the nook. And don't worry too much about lining up your sink and range. The only time the offset would show is when you were standing dead-on straight to the range and obsessing about it. And setting your faucet to one side would effectively camoflauge any offset anyway. I'd agree with the idea to expand your kitchen into the nook, because the existing kitchen space just seems too small for the rest of the house. Maybe a nice hutch-style piece with dish storage and serving pieces on top, linens and ugly stuff down below? Then a really cute but comfortable 'bistro' table and two chairs in front. Someting cozy and intimate. Keep your decorating style the same in both rooms and make it a gracious eat-in kitchen instead of a separate breakfast room. For your dining room, I totally agree about ditching the angle and squaring it off. It'll be so much more furniture friendly, and it's not a large room to begin with...

I’m no expert but I think this is stunning!!

I think you're looking at too many stars. If you choose a waterfall counter you should know that it will add not only extra material cost, but you also will incur extra costs for fabrication as the ends have to be mitered exactly to get that seamless look. You need to ensure that your fabricator is experienced in this area. If you decide on the waterfall counter, I would not do a contrasting island colour, and would probably do a quiet backsplash.

Can't exactly tell from drawing but by dimensions it looks like you can do two and two. I would use 12" pendants.