Anyway, I'm probably gonna have to open this thing up again, joy.
Anyway, base install of this geeky OS is working and I've read the default message and the afterboot man page. Taking a break from it now. With an old USB hub and some extra time I should be able to make this look a little better and start installing software.
Didn't there use to be a snarky message in 'afterboot' about what window manager you should run instead of the one Theo de Raadt prefers?
I spent the whole afternoon away from the iBook and yeah, that process was hanging. Forced shutdown and trying again one more time.
Lesson learned: whatever you do, don't shut the lid without doing a full shutdown first?
More concerning is the intermittentness of everything. My first hunch is that this is because the hardware is really, no-take-backsies, at the end of its life.
For future reference, in case I do want to continue this experiment, these were the steps I tried to follow at the Open Firmware boot prompt to get my root access back:
https://www.cyberciti.biz/tips/reset-forgotten-openbsd-root-password.html
But I only got as far as the first step because the system said "no can do" and booted normally, leaving me without a clean way to shut down again.