Day 2:
Quite a lot of UI stuff today, with pretty much all of it out of the way. I'm not super happy with the book background but everything is operational up to and including assigning build options to the hotbar and entering/leaving construction mode. It's also prepped to send messages to the internal server to actually action, so tomorrow I'm hoping to complete constructing things, as well as operational stuff like a processor building to process bodies, and the conveyor belt functionality to move things around.
Don't mind the messy test map ;)