If you have a local lumber yard, not Lowes, Home Depot, etc, but a real lumber yard, go in and talk to them - you may need to talk to one of their contractor support folks or someone who deals with special orders. They should have a millwork supplier or two that they deal with and IF such a thing exists, that where you'll probably find what you're looking for. For cherry - you may be pushing your luck... But good luck!

Cove molding is a variety of crown molding with a concave profile. I don't find that it makes the ceiling look higher; some experts say that by drawing attention to the ceiling, the ceiling may in fact look lower. To counteract that, paint the ceiling a lighter colour than the walls. Crown molding does make for a smoother transition and is characteristically used in more expensive traditional homes. Or in homes that are aspiring to a traditional look. Plaster Cove Moulding Handpainted Detail on Plaster Moulding Crown mouldings are made of polyurethane and other foams, wood, pre-caster plaster and cast-in place plaster. Here is a link that might be useful: Balmer Architectural Mouldings

The first issue is that wouldn't be heat resistant enough behind the cooktop. It will scorch. You'd need to have a range with a backguard on it, or do that section in stainless. A full height backplash is usually done as a separate set on piece, because of the difficulty of fitting around all of the cabinets. (That's how all stone full height backsplashes are done, like below, with a bead of silicone in between the two.) That doesn't lend itself to coving, only set on. However, if they did the standard coved backsplash and then did a separate piece on top of that, and then joined them, that might work to give you the look. It will be darn expensive. The only fabricator locally that still does it charges $40 a foot for it, which isn't far from the material cost itself. So, it almost doubles the price of the counter, and you're already almost doubling the price because of the added material for the full backsplash. We had some issues with the stone fitting perfectly around the arch of the hood liner, even though we cut it a bit larger to cover the edge of it. We had to do some molding pieces to hide the edges.

Forgot to mention the cabinets are shaker style and white. Any comments will be greatly appreciated!