I like the balance of vocal & backing...it is a story song after all.
The reverb might be a little "large" on the vocal compared to the backing...might need some same room tweaking.
I read the baritone as marking the chorus and it works for me.
Added instruments/voices would, at the very least, muddy the tremolo on the baritone.
I may be inclined to bring the baritone to centre stage for the solo though.
Sparse and well balanced to my ears.


Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe