I'm on the verge of submitting the build script changes that I am using. I am working my way through a build now and fixing up some multi-arch include issues.
The biggest issue I am having right now is that I cannot get the arm mysqld to run in a qemu chroot. I keep getting segfaults. I'm working around this right now by running mysqld outside the chroot and sharing the database across multiple chroot builders (raspbian wheezy armhf & ubuntu lucid i386).
The createbuilder script I am using creates a raspbian builder, it also creates ubuntu builders, with shared source tree and shared database.
I have an initial device template for the rpi and I'm researching the MD detection/creation process to see how to proceed there.
Builds take a long time under qemu, there is a lot of waiting to see if the build succeeds/fails.
Once possy accepts the build script changes I will likely request svn access so I can apply patches as I go, it is much more efficient than having to ask and wait for others to apply patches. This is the primary reason I am not creating patches regularly as I go, it becomes difficult to manage