Well, worked a couple of days and the thumb wound blistered over... i think the skin was too new and fragile. So, taking a day or two off to let it toughen up a bit. Meantime, here's the time lapse of the thumb!
Two versions: one for lower-resolution, slower connections, the other ("720p") for the hi-fi set.
Low:
Note: after pressing play, make sure to select "480p" in the quality menu at the bottom-right of the video.
High:
Recommend full-screening for the full thumb-in-your-face effect.