Nice! avoiding recessed lights is a great idea. The Brightgreen website is a great resource. You can calculate the amount of light required for each space by changing beam angles, ceiling heights and color temperature. The calculator isn't set up for wall scones however the same rules apply. Ceiling mounted lights are also a great alternative to wall scones. Hope this helps. https://brightgreen.com/led-lights/d900.sh-curve-downlight 

White-matte cabinets (flat panel, not shaker) and white bench (or maybe epoxy sealed marine ply??...siriuskey can tell you about that), mirror splash. Love the ceilings. I personally would go for a modern, stream-line, no handles, integrated appliances look. This space has real potential to be very cool, even with the slate. It doesn't need any more more texture or darkness. This is a nice kitchen, you should be able to sell it on ebay.

Hello dear, I believe it is to choose and arrange colors to match existing furnishings, or possibly in some cases to even choose furnishings as well to give a certain 'look' to a room or rooms. But, an interior designer is someone who plans, researchers, coordinates, and manages such projects. An interior designer evaluates and designs interior living and work spaces to make them functional, appealing and well-suited to an owner's needs. Interior designers make interior spaces functional, safe, and beautiful by determining space requirements and selecting decorative items, such as colors, lighting, and materials. Recently I have done interior design in my office from HTS Interior Design LLC, who offers an interior solution to meet specific needs from concept design to turnkey Fit Out solution.

I wouldn't go those dark laminate kitchen cupboards. I have the exact same and I absolutely loathe them now. I use to love the darker colours but now I wish I had just done them white, light gray or even the dark blue (although dark blue worries me a little too!). That dark laminate brown is such an absolute pain to keep clean. They show up every mark. I like your stone bench tops though but would look at other options to create the look you're hoping for with the joins and waterfall benches etc. Goodluck with it all!