Hi,
I succeeded in building the KitKat image by using the provided Ubuntu build VM. It runs very smoothly and (mostly) without problems.
In my build I addressed several issues of the original image, including the necessary modifications to the kernel to be able to install paid apps. The next step will be to build the tun device into the kernel to be able to use VPN apps like vpnc.
Everything I built including a short documentation is available in my github repository at
https://github.com/tkurbad/wandboard.
@michrech: To enable paid apps, you can't just change some file and be set. You have to modify the kernel configuration and compile a new kernel. However, a prebuilt kernel can now be found in my github repository (s.a.)
Best,
Torsten