Not sure why this is special
Don't think in 50 years of doing 3D i've seen many projectors that were twin lensed. Not in my local Odeon (Film or Digital) not when using red and green. Seldom in the 1950s (too expensive) .
Although on consumer projectors today twin systems would make for brighter images, but more complex set up.http://www.reghardware.co.uk/Design/graphics/icons/comment/thumb_down_32.png