Hi
    I found the information at 
http://www.bluedonkey.org/cgi-bin/twiki/bin/view/Netbsd/MandrakeLinuxBuild 
very useful and still applicable(except for the patch part) to the 
NetBSDD3.0.1 release. I think it will be worthwhile to mention that link 
at http://www.netbsd.org/Documentation/ under a kernel FAQ like "Is it 
possible to compile NetBSD from linux?" or "Other Information" section.

Thanks
Prasad