You can put the TV over the fireplace, not the best situation but the way the room lays out it is the only logical place to put it. If you could you should add one additional layer on your mantel that could extend it out another 4" to deflect the radiant coming from the fireplace. I would also mount it on a slimline mounting bracket and have the bottom of the TV no further than 4" above the mantle. Ideally you want the TV to be in as straight a line as possible with your eyes. You don't want to look up too high at the TV, it's like being at a sports bar. Also if you can snake up the power and the HDMI from the cable there is a box they make that has both in one so it makes for a very clean installation.

There's a few but Google Sketchup is probably the most available. The thing is, you'd be better off dealing with your architect for this because they would be better to tell you what materials are actually practical, they would know costs, installation times, etc. For example you might not be able to do a lot of masonry in heavy seismic zones and certain other types of cladding may require thicker foundation, etc. Not only that there are a myriad of different ways to stucco a home and so forth. I mean you could use Sketchup to mockup some ideas, but this is work that is honestly best done in concert with an experienced professional.

Excuse my duh-ness but i'm having difficulty trying to follow whats going on here. Are these two photos an exact replica of your house and pool ? If not a hasty sketch with dimensions could help a lot. By kitchen wall do you mean the wall behind the bar ? And where is the pool wall ? Are you considering the covered area as being "inside" ? Sorry for all those questions lol Sometimes when you have a design problem you need to turn it inside out or on it's head. If you can't beat it maybe embrace it by making a feature of it : i.e. contrast by having the lightest colored pool surround and a great blue or tile inside and under the overhang, something that will echo the water color ? If you have a great covered area as in photo you'll most likely be spending a lot of time there and it could be soothing to be able to sometimes retire into a darker inside. In my book, 10M isn't small and also contrasting two floor colors doesn't necessarily make a space seem smaller and confined and may in fact even open it up. Could it be that you've thought yourself into a box here ? Sometimes one needs to give it all a good shake up and see how it resettles.

We solve this issue with our clients all of the time with outdoor water features. We recommend getting a water wall that is suitable for both indoor and outdoor use. Not only will they drown out the noise but will also act as a nice privacy wall. https://www.soothingwalls.com/outdoor-fountains/glass-outdoor-fountains.html