Interactive wall

Hi guys, interactive systems questions here.
I m having a project of interactive wall/surface (something like this Instagram Interactive Aquarium on Vimeo) and planning to use several Hokuyo sensors for it as TD can import directly data through Hokuyo CHOP. Just wonder maximum how many sensors can TD handle at the same time? Is that based on the ability of my hardware?
And if anyone have experience on this, can I ask you how to deal with data from the overlapping area of sensors (in terms of algorithm)? Thanks :grin: