Suggested Screen size:128"
( 10' -8") x 72"
Strongly suggested Throw Distance:15' 5"
DIY Screen Paint.
S-I-L-V-E-R A simple, well proven high gain, dynamic coating. It consists of 1 Gallon Behr Faux Glaze and 4 - 6 oz of Silver Metallic. It needs to be Sprayed.It cannot be Rolled. It is usually considered to be approx 1.4 gain when mixed and applied correctly. And....it's Silver Content does spectacular things for Contrast - Challenged PJs.
.....and that is where the reality check comes in. At 147" diagonal, the Epson 8350 would deliver you 14 foot lambert into a 1.0 gain surface. That is considered acceptable in a totally darkened room....but in your case, the extreme proximity of the Side Walls and Ceiling absolutely requires that they must be painted to absorb the light from the PJ, or the rebounding projected light is going to effectively ruin the image quality. Washed out colors and blacks.
In other words your Screen will be pissin' into the wind.
And that is at 1.0 gain. That "Veil" suggestion would of had you down about 0.7 gain at best, and that would offer only 10 foot lambert. While that might seem to be a help, it's really a case of cutting off a finger to get rid of a splinter.
Which.....in some cases to many, it could be considered acceptable if the entire surface of a wall was outputting that level consistently. Total darkness does make a huge difference, but such totality isn't really all that easy to come by...or maintain.
Now however if your screen surface is 1.4 gain, the foot lambert level jumps up to 19 fl. THAT
would be a very dynamic, almost LCD-like image....at 147" diagonal.
The only drawback being that the Epson 6700 is a 720p machine. Get a Darby Doublet....
But let's say your a hard case and refuse to drop your Roller. Well....RS-MaxxMudd LL is the solution. It's roll-able, and has the gain and contrast boosting you need. But it does it's very best when sprayed, naturally. Can't get past that.
But as mentioned above, you have to consider making sure your walls and ceiling surfaces don't work against you, no matter what paint you choose. That does not mean resorting to Flat Black (...which is both ugly and reflects a blue-ish cast) No, a Dark Gray Satin or Flat "Enamel" is the very best. You could take that Gallon of Veil Eggshell and mix it into a Gallon of Flat UPW Latex tinted Veil, and wind up with 2 gallons of a "Gray Flat Enamel / Satin
" mix that will look pretty good with the lights up, but resist reflected projected light.
Myself, I'd take it further and paint a 5' deep "Shadow Boxed" area out from the screen wall, and paint it a ultra dark "Slate Gray" in a Flat Enamel
. The best possible effect you could achieve is to have that wall-sized Image seemingly floating in space.
You can still mix your Veil into whatever else you decide on and not lose that investment.
That's what I would do iffin' it were me.
But that's me.