On the topic of a live/lightweight installs, check out httpdev: http://cvsweb.netbsd.org/bsdweb.cgi/othersrc/external/bsd/httpdev/Makefile?only_with_tag=MAIN
which uses rump, and ReFUSE to mount a remote ISO on a remote webserver. It would save all that hassle with downloading huge images, or binary sets, writing them to USB sticks, etc. Regards, Alistair