This sounds great! I worry a little that by choosing to use the upper limit of the soprano range and the lower limit of the bass range in an a cappella piece some groups might have performance issues. If the sopranos short the upper notes and the piece drifts slightly flat, the basses may have trouble producing the lowest notes. It was a good idea to split the basses and sopranos in some sections as you did. That should help.
The variable meter works really well. The whole piece speaks the text very naturally.
I also enjoyed the use of brass in your demo video. It suits the soaring character of the piece very nicely, even if it's not the most representative instrument set to imitate a choral sound.
Thank you for including the link to the translation!