Yes, been done. Modern software does combine scan heads well for graphics.
They need not be as close as they are in your drawing, they may interact from air currents, internal position feedback system, and vibration.
In the last five years mirror sizes have greatly increased.
No real need to do that for beam shows, in fact, for beams it looks better if the scan heads are spaced apart. More attractive to the eye that way.
What we need these days is more angle, which is best done with lenses such as Omniscan and Discoscan, less galvo angle = more speed, and speed is life.
Steve
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...