First things first.
I believe that this whole thread should be relocated to the one of the maemo subforums ...perhaps ...since it engulfs both the n8x0s and n900 ...
stipulated in the thread title "M4 and M5" for maemo 4 and 5 os's in the title to differentiate it so folks know it concerns the two os's and the device lines.

Otherwise the hard work you have done will get drowned under future posts residing here in "General"
And that would be a shame.

That is the first suggestion.

Second ...and pertaining specifically to your work you have done .
Good on you.
Even though you are new to the forum ...it is obvious you have been messing about with the NIT line for a while before joining us here.
As well ...your tackling of such issues as you have demonstrated here is admirable and I can fathom you will be an asset to our mad collection of fellows here.
So welcome.

Now to the meat of things.
without going into technicals...and rambling on ...on those...
the blunt end of the stick is ...
Hildon is not an easy thing to implement on anything else other than our devices ..and running the os's properly....as well.

It is documented that even the attempt to bring hildon to gnome was long and very difficult and not entirely successful....though not entirely a failure either.
Back in the day I worked on implementation of Hildon into gnome ...and it was no small feat...on my own....Hildon is a right mess.
Always has been.

Currently if you wish to understand more of your issues and how to possibly (and I say that word in the most tentative fashion...since you may or may not get your issues sorted out ...) get them sorted...
I would suggest referring to the Maemo Leste work being done.
They are currently miles ahead of most every other attempt at working with Hildon ...that has been previously done.
If anything ...the Leste team may be able to help you answer a few questions ...

More importantly ...if you are as sharp as you seem to be...
then I think perhaps the Leste team could use you ...if they felt they could use your skill set.

It may be you can give them a hand and also at the same time accomplish your ambitions.