Since you have just an open space now, with the walls still open. It is time to visit a few points.
I am not entirely clear of your furniture positioning, or final speaker positions, and the orientation of the room acoustically.
I would say that having the mains and center fire into the short axis of the room is a bad plan. The fronts need to be on the short wall firing down the long axis. Doing otherwise, brooks really spoiling the acoustic result.
You are absolutely right to consider aesthetics in the total design. This is far too often given short shrift, with not near enough thought being given to it. Part of the reason is that it is a very difficult arena.
I have mentioned the importance of putting cables in conduit. Any cable can fail, it is all too easy to nail a cable during construction with disastrous results. The big reason is that technology changes, and you have to be able to change cables easily. Neglecting this is a massive mistake.
Allied to that is the house Internet connectivity. If possible I advise making the main HT system also the heart of your house Ethernet structure. This is because it is that system that will place the biggest demands on that system. I find lack of thought to this is a major problem, HT or not. Builders just don't realise that this is as important as the rest of the utilities. However they give it short shrift as a rule.
So I was were you are just a short time ago.
Part of the conduit system.
I prefer steel for the speaker leads. Too few realise that speaker leads can, and do, pick up RF interference and feed it back to high gain stages via negative feedback circuits. You can use tech tubes that are a cheaper easier solution.
These are the tech tubes for the nerve center of the Ethernet backbone. These bring Internet hardwire to other locations were there is fixed equipment requiring access to the Internet, reserving Wifi for mobile devices.
There is a patch bay that interconnects all units and local hubs. Wi-Fi is via the Netgear Orbi mesh system.
Make sure you get good access for cables to your TV locations.
Now you can build in speakers to an extent, and actually turn it to use, and control the rear radiation and mould the distribution pattern.
Dennis Murphy has commented here that a speaker even just poking out from beyond a wall requires some BSC. I agree totally.
I will show you how cabinetry can be made use of.
This is the front of my studio.
The speakers are well ahead of the adjacent wall. The center is a through wall design.
The rear backs protrude beyond the bookcase and the shelf contents help scatter the sound.
If the system is complex, the rear access with a chase behind the equipment is a good idea if you can manage. You need to give thought to access.
Now your other option to use those Klipsch speakers is to build them into a bookshelf.
This is our family room. I like this space. It has been snowing hard all day. That Denver storm went further north than predicted and into the Twin Cities Metro, and farther north than predicted. It travelled as far north as the Brainerd Lakes area. A little south of the metro they had a foot of snow. So I have been in front of the fire today listening to music. That system sounds very good. The shelving largely solves the flat wall problem.
I like it so much that I am currently designing a subwoofer to go into that space below the TV. It seems to be just asking for it to beef up the subwooferage.
The back panels in the equipment cabinet are easily removable to give access.
One caveat is that I design my own speakers and can tweek them to their environment. However, I have done this sort of thing enough to know that what you see here actually behaves very differently to a flat wall.
So there is plenty of opportunity to be creative with systems in the home environment. A system integrated visually and aurally into its space really does add to the pleasure and satisfaction of any system.
