IMO unless you have lovely things that should be dislayed or lots of books I would not do bookcases at all. Get 2 matching lower type cabinets wall hang the TV above one on an articulating arm if neccessasty then hang a nice piece of art above the other cabinet to balance the TV some nice simple mantel decor and you are done . Minimal eye clutter and a heck of a lot less dusting.

Wonder about built-ins if you’re a modernist at heart? Custom built ins would be expensive and I would be tempted to put that budget toward art that you love -

No to the built ins. That's for a traditional home.

If you must do a built in, then make it look like it's a piece of furniture. See below.

is this open to the kitchen, I see a dining table in the foreground... Aqua seems to be the color of choice. I would keep it white, but possibly a pale aqua ceiling? Mount the TV on the wall and remove the console. The IKEA cubbies on another wall... keep the fireplace wall simple with that art.

You don't necessarily have to do built-ins. You could look into doing two different things on either side of the fireplace. Perhaps a book shelf and a hutch or a small shelf with a painting above. Here we have some images from our design portfoilo, which we thought might help you with your dilemma. Please note all of the different ways we have done things for our clients.

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