Now that all the circuit boards are mounted in my enclosure and are wired up...well, it won't close. The wires are too bulky. I'm thinking for future projects like this, the "haphazard wiring" solution will trigger a sort of rule-of-thirds: Leave about a third of the volume for wiring.
This isn't the first time I've hit this problem; my Eve pendant project should(TM) fit in the tiny pendant the way I designed it, but only if wiring is infinitesimally thin. That project will require some serious iteration; this one can probably get away with a 3-D printed spacer shell until I have the chutzpah to work on the next iteration.