First of all, I'm very interested in your work and I would really like to tell you something about my thoughts.

I was working on Ubuntu packages for Cordia a long time ago. I'm sure my packages on launchpad.net are still online and working.
I was investing many days getting Hildon working on Ubuntu and at the end I got it working (well, at its minimum but worked.)
There were many problems with hildon-desktop and all its components which needed some small patches. So I needed so downgrade gtk+ I think. The only problem was that I didn't get much attention, when reporting problems, which would be fixed soon. Maybe we should ask the CSSU team for better support on that.
However, since Ubuntu got alive on N900 and some of you were working on it I would help you getting drivers, etc. packaged (as I already did for Intel EMGD in the past).
In short: My job there was to downgrade all Xorg packages to make it work with EMGD.

I think we should first take care about the Ubuntu installation and make it clean. I mean without doing any modifications as found in the Ubuntu wiki - packaging everything clean and smooth.
When everything is done, we can start taking care about how to install our Ubuntu bundle on the internal eMMC of the N900 and other problems.

For those who don't know. It is very easy getting armhf packages on launchpad.net. I already made automated builds work for the Kivy project in our PPA.

What do you think? I'll be soon online on #maemo at Freenode. Fell free to ping me there - possibly I could be away :/