We’re lucky in the fact we found a spare 180 degree spherical screen lying around our office, so we though we'd give Nthusim a try!
NTHUSIM Plus was aligned using single PC (using an Nvidia 285 GTX), horizontal spanned desktop using a Digital Matrox Triple Head to Go and three Benq MP776-ST projectors.
We used a standard laser level (available from all good hardware stores) to assist with getting the horizontal and vertical grid aligned correctly.
Here's the result .............
Figure 1: Nthusim Plus set-up
To test we tried Crysis and Tom Clancy Hawks.
Figure 2: Crysis
Figure 3: Tom Clancy Hawks
[EDIT] We're planning to develop the set-up and Nthusim Plus to support 3D Vision Surround. Waiting on the new NVIDIA cards and drivers, so watch this space for updates