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Some clues might be gathered from the UPX source code
Here are some interesting aticles for you
Relocation stripper and source
hxxp://www.jrsoftware.org/striprlc.php
Also check out the Morphine v2.7b src
Here is a story on Woodmann about the resource seciton
hxxp://www.woodmann.com/forum/showthread.php?t=4909&highlight=write+packer
Here is Writing Your Own Packer - by BigBoote
http://addict3d.org/index.php?page=viewarticle&type=security&ID=256
However all those articles dont quite answer your questions fully
Hope this helps!
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