What you should in terms of recruitment is focus on getting really good vocalists. These people don't necessarily have to even be good arrangers or producers; just put the call out for good vocalists with good recording equipment. OCR has its fair share, but probably not enough of them. There are a lot of talented amateurs all over the place; YouTube/SoundCloud/etc. I can help you with outreach if you need, via social media accounts, etc. Just put together your requirements first.
Once you find some, you can then pair them up with talented arrangers here at OCR and we can proceed from there, i.e. source selection, lyrics, etc.
A fully vocal album is going to be heavily scrutinized; far more so than other traditional albums. We can't settle for vocal performances that are just decent or good enough; we have to shoot for nothing less than perfect. This means we have to turn a critical ear towards all of the material we get, and really focus on things like breath-control and pitch-control and a whole load of other stuff that actual vocalists (i.e. not me) can tell you about.