Manuscripts are very hard to transcribe, and only get harder the older they are. You can already split up transcription work for printed public domain texts at

Manuscripts are very hard to transcribe, and only get harder the older they are. You can already split up transcription work for printed public domain texts at the "Distributed proofreaders" website, which feeds Project Gutenberg -- Wikisource has a similar subproject, albeit one that's not quite as advanced. But neither of these will help for something as complex as this.