Wall mounted ovens are definitely a more comfortable and user friendly position, however, it's not just the height that causes discomfort. You need to be wary of the door too. All wall mounted ovens have doors that open down to create a shelf, which means that you cannot physically get close to the oven shelves. This can create issues for your back when reaching into an oven with something heavier, and the shorter you are the more of an increase risk of back strain. With floor mounted ovens you have the potential of the conventional door side swing option which would help with the problem mentioned above. An ideal scenario would be wall mounted ovens with the slide away oven doors as seen in the Great British Bake Off. These ovens open downwards, but the door slides into the body of the oven, so that you can step up to the oven itself, negating a potential for back strain from stretching.

I think you see bars (serving beers) with stools and no overhang. These are fine for a social setting where one person might be sitting with their back to the bar chatting to others in the room. If you intend to use the bar for food you need to face the island so will need the recommended leg room. Could you swap the 600 deep cabinets for 300mm deep? The cost of new carcasses might not be too bad. You should also talk to your kitchen fitter as he may be able to install them after the quartz.

Not sure if you are renting or you own the property. If renting then you will not want to drill holes in the walls, especially if they are tiled. Here are some possible thoughts for both eventualities... https://www.roseandgrey.co.uk/brass-five-tier-display-shelf https://www.rockettstgeorge.co.uk/curved-brass-shelving-unit.html https://www.amazon.co.uk/HGT-Bathroom-Glass-Shelf-Brass/dp/B00ANGO2FU https://www.victorianplumbing.co.uk/miller-bond-brushed-brass-glass-shelf-8702mp1 If you’d consider black freestanding: https://www.wayfair.co.uk/furniture/pdp/chateau-chic-narrow-134cm-etagere-bookcase-chte3415.html

After having seen the style and look you like, although we spoke about dark cabinets initially, with the floor you have chosen which would compliment any style, how about considering a natural wood like worktop? If you would like a light, and airy look and feel to the kitchen, neutral coloured cabinets would suit the look of your kitchen, paired with a slightly darker splashback to add that luxe feel back to the kitchen. This combination of a darker splashback, with wood and then lighter cabinets would also work well with your accent gold bar stools in the first image you showed. Keeping the foundation of your kitchen balanced and adding accessories such as gold bar stools and some decorative elements to give it that sparkle and glint that you like! (featured here is our petrol blue splashback panel, however I feel our blueberry panel would also work really well with this combination)