Good grief has getting this going been an arse.
The setup I've been trying to do doesn't quite match up with the guides others have made (I'm using a dist kernel bin, luks and btrfs). After apparently messing up my first attempt with the network devices not existing after getting the boot going, I nuked it and started fresh.
Using the minimal image this time, and a little more trouble with getting grub to prompt to unlock luks, I finally got a stable booting system.
Now onto installing plasma, weeeee...
Here's a blurry picture. Hopefully I can take screenshot again soon.

