Guys, about angles: I see Mayman mention 47 degress or so, and Latte you said you believe you'd go for about 50.
Latte- have you mocked that up with the short throw Optoma's yet on an angle? I see your test pics show them in a straight line. In my build, I found the Optomas wouldn't work placement-wise unless I made the angles shallower. My center screen is going across a corner (my center projector is rear projected.) So if the side screens were parallel to the basement walls that would be about 45 degrees, but that doesn't work with these projectors and where my seat is placed. Particularly on the left side. Since the lens on the Optoma is on the left, for me to center the image on a screen angled over 40 degrees or so, I'd need to have the body of the projector in my seat.
Remember, these are fixed throw distance projectors (no zoom), and do not have horizontal keystone correction, so the lens needs to be square to the center of the screen (a few inches below the bottom of the image, or above if you're inverting.) So what works in my case placement wise is a much shallower angle. I got a cheap angle protractor @ HD the other day and it looks to measure about 35 degrees. Any more raked in and I don't have room to place the projector.
See the attached mock-up pic. Note this was using two Qumi's (like Mayman) for the sides, which I've since returned. I could not get them to match in colors or brightness the center Optoma (which since it's rear projected, needed to be a short-throw, unavailable w/ a Qumi.)
Anyway, if you look at the pick, to the left of the seat bolster, and I mean DIRECTLY to the left, is where the Optoma short throw projector has to sit. (I'm thinking of building a small mount attached to the floor and covering it with a protective surface which will also be a hand-hold to get in and out and maybe keyboard placement.) If you see in the pic with the lights on (ignore the "in-progress" mess please!), between the aluminum pole at the rear left of the seat and the front left of the seat is where the Optoma will fit, jammed right up against the seat (fortunately it vents heat out the front, not sides or rear.) In fact if you look to the right of the seat- see the PC tower w/ keyboard? The 3rd Optoma is sitting on that PC now for testing and aligns with that screen. You may notice the tiny Qumi projector behind the seat at the very bottom of the pic. These have quite a bit further throw distance than the Optoma, and were also in my walking path into/out of this area of the basement.
So if I angle the screen in more, the Optoma needs to sit IN the seat to have the lens close to the horizontal center, so that doesn't work. I already sit very close so I can't move the seat enough closer to fit the projector behind the seat, so this is what I'm moving forward with. (By the way, ignore the color and contrast mismatch in this pic- part of that is glare my camera phone got from the center screen, and they blend much better with three similar projectors now anyway.)
So my question relates to the angle adjustment in Forza multiscreen settings vs. actual physical screen angles. I believe in the pic attached I had all three consoles set to about 50 degrees. I notice when you go low, like in the high 30s- low 40s, it affects the total field of view, in effect zooming in so you see less of the steering wheel and cockpit. I prefer it as shown, where (if you can tell), the actual wheel I use is lined up with the on-screen wheel, and I'm looking at the gauges through the opening in the real wheel, like the LCD in this prototype car in the pic. If I set the angles closer to what is reality in my case (35 or so), then the LCD gauges on this screen are cut off and not show almost at all. So I wonder how this "angle" setting really works in FM4? Would I have an easier time aligning all the objects if it matched my real angles. If so, is there a way to zoom out still to have more FOV so I see the lower part of the cockpit? Or wonder what would happen if I set the center screen's console for something like this in the mid-high 40's (to see all the gauges), but then entered a different value closer to real angles for the side screens' consoles? That probably would make objects in the side screens larger/more zoomed in, which wouldn't work. Urgh, it would be nice if you could change these settings on the fly to see instead of having to restart the game every time.
Anyway, I'll do some more pics and experimentation when I get a chance. A bit burned out from working on it a lot during the holiday and I just want to get it done!
just a pointer as to what angles we're actually talking about.
none of which are gonna help me if someone doesn't give me the slightest hint as to where you are taking these angles from 
I guess I'll have to grab a slim tomorrow.
