Personally I would pick something different as that will be Macabus overload in my opinion.

I love Macabus. I’m no designer, but if it was me, I’d pick something different. Something subtle so not to take the limelight away from the Macabus.

Horizontal lines running across the back of your kitchen wall are going to be very "bossy". And please do not install it going vertical either, you would have clashing horizontal and vertical lines where they meet.

This is one of those cases where a 4" splash would work well or choose a single color plain tile in a larger size.

Not an expert here, but I think it could look good under the 64" area. Though not sure I'd like it on the open wall.

macaubas quartzite - Google Search · More Info

macaubas quartzite - Google Search · More Info

macaubas quartzite - Google Search · More Info

I would leave the side by the peninsula bare, and use a plain white quartz or white subway tile just on the area under the cabinets. You may even be able to do without a back splash on either portion since your sink is farther away.

Technically speaking these applications are sometimes set into the wall a little, so you'd need to consider sheetrock removal if you want it set in more. You can also round the exposed vertical edge so it tapers down toward the window sill.

Thank you everyone for your comments - will look at tile.

To my eye, what is too much visual overload is different textures and geometry. The full height splash would be wonderful.

I am back to the difference between the quartzite thickness and window trim. I would only gain a quarter inch with taking out the dry wall. Ideas for the difference?

Finish the stone ends and let them be proud of the casing. Not a big deal.

I’d look at MSI Highland Park in color Pearl. It’s a very subtle crackle tile in a greige tone that would look wonderful with your quartzite.

If you choose to do the stone, have the edge against the casing done with a large bevel, to angle back to the casing. Or, redo the casing to bulkier proportions.

I think it’s overload, and wouldn’t do it.

There is an art to knowing when you're done - the space looks beautiful as is. And goodness, what a view! I would probably go for a 2" "tray" bs against both the shorter and longer sections on either side of the window.

I totally understand wanting to see your stone on the vertical expanse. It will be a little "bossy" but everything else in the space is so serene. If you want to do that, 1.) consider using it as a bs for the larger area only, with a 2" bs for the other side, and 2.) ask your contractor to beef up your window molding so that it meets the stone.