Just finished the draft of my essay. It took more than just plugging in citations, it required a fairly comprehensive revision! Still, it's good, and just in the course of reviewing my sources again I was able to narrow the date range for this manuscript to between 1138 and 1150, which might make it one of the earliest copies of Peter Lombard's text in existence (if I can find a source for that claim, I'll include it when I submit my final draft but at the moment I don't know how many early copies of this work exist).