I have done the 3 split screen… combining all three monitors using Nvidia’s utility (it is done by someone else, so I am not sure how it is done, but it is not difficult). The implementation uses 3 gui widgets which get painted using render texture from 3 screencapture2d. You have to really degrade the quality of the main screen (which gets obscured by the 3 widgets) to attain better performance. There should be better way to do this, IMO.
We further network this setup to 2 other computers, therefore attaining 360 degree view (45x8, where the last pc only has 2 monitors)