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All that software is available on the net right? When you untar/gzip them they probably have a "README' & "INSTALL" file right? Problem with most people is they need there hand held and can't read a readme.
Before you try and tell me I don't understand Gentoo, I have it running on sevreal box's includeing Sun Ultra 10, 60, sb100 and many others. So don't go there. I just fine Slackware to be my favorite on my main system. ;-)
SElinux/Pax blah, blah & blah werent invented on Gentoo and yes, you can find doc's out there that show you how to install it. Of course you could always look at the web sites & readme's, those always help.