Id be gutted just the same if I got that far with all that work. It was looking really good. i agree with the comment earlier about led rope being behind the screen to give off a glow of colour. Def do another wall with tv at eye level. if thats the look you was going for i say go for it. dont compremise on the vision. check out some other on the forum they have they floating walls at a lower height and look really good.
Just build another one exactly the same but lower by a good foot or so so its about 6" above your unit depending on how high the unit sits. The easiest thing to do is get a laser pen or something sit on the sofa and hold the pen at the height of your eyes and thats the centre point where your screen should be.
I did it by sitting on the sofa and measuring my eye height from the floor and that was my centre height. My bracket is only 38" from the floor but the tv is at the perfect viewing angle when sat down, i.e right in front of you so you don't have to sit with your head tilted back.
I can post a pic of mine if its helps but its not a false wall.
This is an old photo with my previous 40" television. You can see how high it is compared to the sofa.
And this is the new 55" which again sits at the perfect height. I've just measured with a tape measure the top of my mounting bracket is 38" from the floor although it may slightly depending on how heigh/low your sofa is.
If you did the same you can simply build a wall around it once happy with the angle/picture quality.