Rachmaninoff's 'Bogoroditsye Dyevo' - but no one else wants to sing with me

Attempting all 8 voice parts for 'Bogoroditsye Dyevo' from Sergei Rachmaninoff's 'All night vigil' (Op. 37) because I felt like singing it and no one else was around to join in.
There are 38 separate vocal parts layered together although I only videoed each part once. In the videos I was singing pretty much from memory so the visuals aren't always 100% accurate.
This is a lovely piece and brings back good memories of choirs I've sung with. I hope you enjoy it too!
As always, the performing, recording, mixing and editing is all done by me, so any issues are entirely my fault!