I finished editing the video this morning. Even after lining up the audio and video tracks, there was one point where the audio slipped right in the middle of the take. Luckily, I had leaned out of camera range around that point, so I was able to split the audio track there, copied and pasted an additional tenth of a second of background noise at the point where my mouth wasn't visible; problem solved.
Vegas renders the video much faster on this machine! :-) Hope to publish it soon and get this campaign rolling.