Little got done Tuesday and Wednesday. Today I've gotten some stuff done for sandbox mode, with the most work going into the display of the edit cursor. Yeah, pyglet still isn't extremely easy to work with, but at least most of the objects in the game are going to be drawn as part of the worldsim, and that's mostly working well now.
Note: I'm trying to post here a lot more now, not just to keep you guys appraised, but it helps me to stay on target. I'm not just having to navigate the vagaries of the design of In Profundis here, but the contours and roadblocks of my own brain, some of which is difficult traveling.