So, this afternoon I went over to Peter's house and we worked on recording the chorale. We focused on tone quality and diction, and we got some pretty good takes. Apparently this is quite a lengthy process. Peter tells me that for a professional recording, you can work 4 days straight just to get a good take of one person singing one track. The singer records the track several times, and then you compare the different versions and take the best bits of each. That was useful to know. For the final recording, we plan to have 12 voices, 2 on a part. I'm really looking forward to hearing the finished version!
[Update] He estimates another 24 hours to complete this first draft; that will be 8 more 3-hour sessions.