This looks really really cool, will try tomorrow if we can boot up our custom raspbian image and maybe use it to test.

It should, from the docs:

> A full ARM environment is created by using Docker to bootstrap a QEMU virtual machine. The Docker QEMU process virtualises a machine with a single core ARM11 CPU and 256MB RAM, just like the Raspberry Pi. The official Raspbian image is mounted and booted along with a modified QEMU compatible kernel.