Thanks for the help guys!
1) I mentioned I won't ever open them more than enough to view the TV, so I don't care about stackback width (unless it can't even open 2-3 ft on each side, HAHA!).
2) The screen is actually going to be IN FRONT of the curtains! I haven't completely figured this one out yet, but the TV would be behind the curtains, the screen would be in front of them - and it wouldn't get in the way. That's an entirely different project that we won't get into yet.
3) I saw on htmarket they have 20ft rods that support 110 lbs of curtain. It seems like I'll have more weight than that if I do this. Would it be possible to have 2 rods (split down the middle) instead of one, and support each half on its own rod?
4) The other windows on the side wall are not a big deal as I'm not projecting towards that wall. I've tested this and it's not something I'm considering right now because when there are no light sources behind my projection, (regardless of where windows are) it looks good.
5) I can still consider blocking only the windows with their own separate smaller (width wise) drapes. I was doubling the larger drapes use for having a non-white wall behind my screen (to help contrast ratio), and to have a cleaner look when doing movies (and I read that TVs behind projector screens can cause some minor reflection issues).
I am normally a bang for the buck guy, but that doesn't mean I wont spend money if I think it's worth it/quality.
I could do light blockign blinds, I went with levolars half light blocking for the bottom (as you can see) and it's not enough even at night (light sources outside).
But that in itself can get expensive. Let's say $300 per window for complete opaque. $1200 for 4 windows right there. Now curtains/rods. I'd rather get higher quality fabric/curtains with that money, since those will be visible 100% of the time. I don't plan to open the drapes enough to see those windows!
This room has 8 windows in it, it gets plenty of light during the day, and it's meant for theater usage at night and TV watching during the day.