I have sketched the whole of act 1 scenes 1 and 2 of the Opera known as the Psalter. My most recent delight was adding a flute part to Psalm 5 - rather fun I think - MP3 here (vocals alone here, sheet music here). We'll see if it's playable - maybe try it out on Thursday.
The outline I suggested last month is holding out at the detail level. As I worked through the scansion for the music, I changed a few details in the text. A dozen or so. I think I won't meditate too much on this first part but forge ahead into the remaining music - rather a lot of fun - and no manuscripts to fuss with.