The front rubberized section separates from the back section. I used a knife to push the gap open, then used a credit card and a lot of wiggling. There does not appear to be any glue holding these together, just a tight press-fit.
All of the interesting stuff is in the lower (rubberized) half. This appears to be constructed of several separate pieces, but they are glued together. Attempting to pry off the internal cap just broke it.
All of the electronics are on this one board.
This video has a good discussion of how the Wacom technology works: https://www.youtube.com/watch?v=j4AKwJERxOw
Here's an x-ray of the internals. Posted about here: https://www.reddit.com/r/RemarkableTablet/comments/iozka0/for_fun_an_xray_of_the_remarkable_pen/?context=3