Well I outline what I want to do here: http://radicaladaptor.blogspot.com/2008/10/using-android-platform-for-prototyping.html
basically: I want to build a computer with a touch screen that runs android and I want to leverage the User Interface of Android and the Application Framework. I do not care much about the underlying things.
At this early time of the project I want to check out the feasability of such a project and pretty much only care about using the UI Elements of android. Especially because on the porting-android mailinglist they say, that a x86 port is in googles repositories and I do not have alot of time these days I want to have something to show to others to persuade them to join my efforts. So basically I need something, that you can see and touch and it should require the minimum effort. So IF it is possible to bypass all the middleware stuff in the platform, I sure want to do so.
In the long run I of course want to run the android version of X. My targets architecture is not fixed yet. May be x86, may be arm. For the prototyping I go with what looks easiest.
Please keep me updated on your work!
PS: Look in build/core/envsetup.mk line 90 following. It seems like you can switch to x86 there. However not very much gets build...