I can help you OTO CVVC voicebanks! I'm working on OTOing another voicebank though, however I can still teach you how to OTO CVVC voicebanks! It's practically the same as OTOing CV voicebanks, except the overlap in the CV notes are about 1/3 of the way through the note for every note, and in VC transitions, the preutterance goes after the vowel, and not the consonant, and the overlap is the same (around 1/3 of the note).