Ah well now, the tenor guitar has the same range as a cello - just an octave higher - so the melody fits neatly on the strings. The melody is actually not that simple - there are some little twists and turns on the strings which require good practice to get them running smoothly.

Added to that, the scale length of the tenor plus the key of D means some big stretches in the nut-2-4-6 fret configuration. I prefer the contrapuntal sound of the single string melody of the tenor line intertwined with a similar single bass line - the two fit together very attractively.

The beauty of the unaccompanied cello suites is that polytonality (chords discordant or otherwise) is implied in the melody, rather than obviously stated. Anyway - thanks for the useful comments, and good luck with it if you give it to your band!