command control for large scale

[Casey_Jones]

Question,

I know you can use DCC in large scale, and MTH is using its DCS in Large scale. 

So, could you install a Proto 2.0 board into a Bachmann Big Hauler or Spectrum loco and control it with DCS?

Could you install an Electric RailRoad command board and use Lionel's Legacy or TMCC Cab 1?  I know folks in O Gauge 2 rail and S gauge use the ERR or Railsounds 4.0 in their equipment.