Seeking Advice - Retrofit upgrade to 7.1

Hello fellow AVS'ers!,


I built a 2-story home in 2006 and was severely limited by the home builder as to my ability to run wires - that said I had to pay them to run 6 wires (what they called a "5.1 package").I used 3 in the back, thus the single Rear Surround(RS) and 3 up front (the front ceiling center remains unused) I have regretted not doing it myself despite being told not to, especially since it was $300 and they used what likes like phone cable


Ok, enough sour grapes. I have attached a rough illustration;



This is my current set-up (center in in console under TV).

I am considering adding crown moulding to the entire room and will have the opportunity to add 2 more speakers (not much other options being as how the ceiling is the bottom of the upstairs).


What I have in the back-ceiling is Polk LCi80's x3. So I'd be getting ONE additional LCi80 and removing the RS as shown, and moving it up to a proper/side surround location.


The questions I seek advice for are these;

1. Is a room this size worth a 7.1 set up?
2. Is retro-fitting speaker cable in a 2 story home too difficult
3. Do I need to relocate ALL the in ceilings for a proper 7.1 set up
4. How bad will my ceiling look if I have someone "try" to repair 1,2 or 3 previous holes!

Thanks in advance for any advice.

Tv Side:



Front Window side:



p.s. these are from when we moved in, we actually have drapes now, lol!