Those fretboards are massively wide. It must be tough to play them. I guess you might have to use the right hand to play the low notes perhaps?
Personally i'd love to have a semiacoustic with a built in harp that could be played with the right hand and a nice low action so notes could be played single handedly with the left.
All these extra strings are a fine idea but if you want more range its probably cheaper to get an octaver or whammy pedal.