You have a substantial amount of harmony of the melody in thirds and sixths. Having this be your only source of harmony would irk me a little bit, but at the ends of your phrases you carry on your suggested voice leading in the bottom part which makes it sound more continuous, which is a good counterbalance to the constant harmony.
@pateceramics
Good point. They are volunteers, but they are very talented/skilled players who I’ve grown up with playing music and I know that they can handle this piece. You’re right though, it does take some endurance and focus.