You may or may not be aware of this, but there is a decently large community of people who record audiobooks for free: LibriVox.org. Their forums have a lot of resources and technical advice on how to do this, and they're quite good at offering technical feedback as well.

I would strongly advise you to submit your work there to receive more expert comments, and quite possibly recruit some new reader (meaning both "expanding MoR's audience" and "getting interested volunteers for the audiobook").

I'd actually be interested in participating, but I understand perfectly what a hassle it would be to piece together multiple voice actors. Dibs on Quirrell if you change your mind, though!