Late to the party, but I've been fancasting AOS versions of TOS novel characters, and fell in love with the idea of Gina Holden as Enterprise
Chief Engineer Caitlin Barry from Vulcan's Glory
and The Rift
Also, I could totally see Natalie Morales as a young Charlotte "Caliente" Chavez in Who Much...?
mostly cos Wendy Watson could SO hold her own against Jim Kirk. (This particular fancasting came out of a long Livejournal thread about Noser playing "Stump the Band" with the current Enterprise
I've already posted this in other casting theads, but here's my Cait: