Sure back to Bach.
I don't know about arranging but I quite like working with the Jerry Willard book of Lute Suites. There are a few ill advised chords and he tends to organise his fingerings so that the most difficult shift comes at a phrase end with a new chord and that kind of irks me. Musically my problem is that he often breaks a bass line for a shift to a higher octave on the down beat. This is most unsatisfactory to my ear as it leaves tensions unresolved in the bass register.
I also love reading through the Violin Sonatas and Partitas straight from the violin score. The Peters edition I have is really clear and well beamed and there is the wonderful facsimile of Bach's superb and intention laden hand written part at the start of each Sonata which really helps to show how he conceptualised his melodic flow.
For Jazzers it is always good to compare bar by bar the Doubles with the dance movements which precede them. The former are pretty strict chord by chord melodic elaboration of the latter. I wonder if this is one of the ways in which Bach intended these pieces to be for study. It certainly gives would be composers and improvisers plenty of food for thought.
D.