that warr guitar is more like a touchstyle instrument, but it can also be played "normal" like a guitar or a bass. i´d love to have one of these ... but 7000+ bucks is a BIT too much for me.

and as for that guitar with a built in harp. such guitars do actually exist. they have ben used in vienna mostly for old-style vienna music. its called contra-guitar and it has a few extra strings off the fretboard like the old archlutes to play the bass notes with them.

this one here has 15 strings all in all: