Ask your cabinet maker if he has access or a supplier you could get some reclaiimed lumber to build your cabinets out of. If you want rustic, this would be an excellent material to use, find the right one and it will have lots of character and usually a backstory of where it came from (i.e. an old barn, factory, pulled from bottom of lake, etc.) Would look great in the shaker style you are favoring. Use same material and have your cabinet maker build a custom entertainment center to match cabinetry. Will tie rooms together beautifully. Backsplash would look great with a stacked stone paired with concrete countertops. I admitally have a preference to concrete as I am a concrete artisan, but do recommend as they compliment rustic settings very well. I've included a link to a FAQ's page I created regarding concrete countertops, feel free to read to help you decide if you may like concrete counters. If you have any follow-up questions, feel free to ask as I'd be glad to try and answer, or find a local concrete artisan and inquire into what they may have to offer for your project. https://www.houzz.com/discussions/concrete-countertops-faqs-by-twisted-minds-custom-designs-dsvw-vd~346684

I love your kitchen design with what appears to be a corner sink under windows and the pass-through at the other end. ! I also love the bright and fresh-looking white cabinets with the neutral beige counter tops and, for contrast, the black and silver of the stainless steel appliances. The room is so light and airy, and I am sure it is a joy to see in the morning. The pantry and the lower cabinet under the double windows are wonderful features, too. The door to the right of the lower cabinet appears to lead to a hallway and back door, and this makes it so convenient to bring in and store groceries.

The tiles were actually porcelain/ceramic, but not revealing in these photos, there were many that were broken or cracked. We decided to remove them, but a friend who “collects old homes” came and painstakingly removed as many as possible to put in one of his old homes. So, while we lost them in this house, they weren’t completely lost. 😊

I'm struggling to understand your question. Could you restate with a rendering of the entire space? Are you thinking something like this: