thank you VERY much for this detailed Howto! I will definetely try this within the coming weeks.
However before this - I will try to redo my previous test with english kernel on a different machine which has more than 4GB of RAM, because I think the reason why this did not work is that my machine does not seem to support memory remapping. I think this is the case, because when I boot up the machine on Windows XP Pro 64Bit I see the same amount of free memory (3,25GB). This could be the explanation why it did not work as intended before. When I'm done with this, I will give the WinDbg-thing a try. I will let you know the results (including USB-plans).
Again: Thank you very much, I can see how much time you spent for this!