I love the design. I am old but like open spaces and moved to a condo that is almost all open spaces a little over four years ago.
The JVC will definitely be able to fill the room with sound. Mine can get loud enough to overwhelm. Due to the configuration of your room, you may not get a lot of surround effect. With proper settings, the sound field should extend out beyond the physical sides of the soundbar. The Yamaha could probably extend this even further.
My room dictates that my home entertainment equipment be located in a corner with no side wall to one side and the first wall to the rear about 38' from the front of the soundbar and the final rear wall almost 60' away. When I had the Yamaha YSP I could find settings that would bring the sound close to my sides, but to adjust it for that much surround required a large degree of phase shift and sound processing. I have spent almost 40 years looking for clean, accurate sound and sonic accuracy has always been my number one criteria. I seem to be especially sensitive to phase discrepancies. Therefore, after months of experimenting with the Yamaha, I eventually settled on what was basically a 3.1 setup with just a little surround to extend the soundstage to the sides slightly. The JVC can achieve a similar degree of surround or sound outside the physical parameters of the speaker with just a little adjustment with little or no sonic degradation. I have also helped a neighbor with the same floorplan as mine install a Sony CT-150 with really good results. Probably a little better surround effects with a small loss in sonic clarity compared to my unit (I think as I have not compared the two side by side).
Anyway, congrats on a beautiful living space and keep us posted as to your purchase, set up and satisfaction on your soundbar.