I don't see the need for two table seating areas so close to each other - just keep the dining room and use it more. So, I like your idea of making a triangle-shaped pantry against that angled wall. I would probably just put the Fridge on against the bottom wall of it with the door to the Pantry next to it. The right side of that wall is then a nice blank wall perfect place for a bar area, artwork, sideboard, or other item. I would then: put the range on the left side of the U; make the left side of the island completely cabinetry (no overhang) so you can have a prep sink at the top left corner of the island. The seat that was there moves to the right side of the island so you have seating on two sides of it; put the MW in an upper on a shelf, or a drawer MW below the counter, next to the range on the side nearest the fridge/pantry; completely delete the right wall of the U so you can make the island at least somewhat bigger whether you remove the wall entirely or not; put the ovens to the right of the sink; and put the DW between sink and ovens IF you need an obstruction-less secondary prep space (between sink and range) more than an obstruction-less baking zone (between sink and ovens. I don't think a half wall is going to do much to hide kitchen mess for you, but if you put the ovens next to the sink like I recommended at least the cleanup sink rack, mess etc. would be hidden from the entrance. However, a half wall with some nice trim, maybe some posts, etc. would provide an elegant separation between the DR and Kitchen plus some nice display space. Going without would give you a bigger island. It's up to you.. Anyway, HTH! I love interesting spaces like this and I think you can have a phenomenal kitchen.

Ok, we took it out after builder checked and double checked every possible concern I had. He was very patient with my concerns, but carefully showed me all the evidence from basement to attic that it was just a partition wall. A different wall, which went all the way to basement into its own foundation, is clearly the spine wall. Anyway, the wall we took out was the weirdest wall... Basically wood boards going floor to ceiling, with no studs, braced by a flimsy diagonal brace, covered in lathe and plaster and then a later layer of drywall. I suspect the rest of the house is built the same way-sort of like a drywalled barn. Builder said he had never seen anything so weird...has anyone every seen anything like that?

Wallboarder rather than a carpenter. Inevitably there will be repairs need to wallboard after glass removal.

First, the moss is of no concern to the concrete wall other than any appearance considerations. You don't need to remove it unless you want to. If you must remove it, power washing (or a strong stream of water from the hose) will do the trick. If the surface is small enough to be manageable, you can also use a paint scraper to scrape it off. Avoid using any of the bleach or vinegar solutions posted online. They will kill or seriously damage any desired vegetation present.