The motor on this one's mounted off to the side, since it has to drive the tonewheel assembly that runs most of the width of the instrument. Not sure if others did it differently. (Unless by the motor/speaker thing you're referring to a Leslie rotary speaker cabinet? Don't have one of those, but I'm keeping an eye out - that'd be great to have!)
Like most electric organs it does have presets named for real instruments (trumpet, ensemble, etc.,) but you'd be hard-pressed to describe them as "realistic;" they're just pre-picked settings for the drawbars that give vaguely reminiscent tones. That's okay, though, the drawbars give access to a wide range of great sounds :) (You can kinda "play" them, too, by pulling them out or pushing them in while you're holding notes - very spacey, Rick Wright kinda sounds!)

