Hi there, 
do you mean 11 HD 1920x1080 px Videostreams in realtime with effects and interaction ? 
Or are you going to take a HD Video (Graphics) and split this to 11 Projectors ? 
What Projectors are you talking about ? 10T Ansi 20T Ansi
How far is the Observer away from the Projection? If you need 11 Beamer it may be tall. 
And then the Observer/Crowd must be at least 50 to  150 Meters away from the Building. 
It's an horizontal installation made with 11 videoprojectors connected with a dataton watchout system. So we'll have 11 full hd out put to connect in a mac pro machine to use it all toghether than use modul8
Usually Watchout is last before the projection.
At least that´s the way we used it in production. Then Modul8 is just an input for watchout. 
And the Watchout system has 11 outputs yet ? 
I´m just asking because i don´t get the setup , but maybe it´s just me. 
pele2010