k dude, take it easy. my previous post explained pretty much but here it is again. hope it'll make it clearer for you.
'still waiting for root device' means that system is still looking for boot device, in this case for your hard drive. but it cant find it cause you didn't install any hard disk controller driver / chipset driver. In the post above it also says how to include all the drivers you need by customizing your installation.

Download AppleNForce ATA.
<a href="http://www.mediafire.com/?xgrpjt2t0zy">Nforce driver</a>

Unpack kext from zip file and save it on a USB stick. Insert Mac OS install dvd, restart the system
and boot from DVD. When Installer starts, from the top menu bar launch Terminal.

sudo -s

(copy NForce kext)

cp -R /Volumes/Flash/AppleNForceATA.kext /Volumes/Leopard/System/Library/Extensions/

(instead of 'Flash' label i used here you have to use the label name of your Flash stick and also
instead of 'Leopard' use the partition name of mac os installation.
you can do 'cd /Volumes' and after it 'ls' to see partition labels)

(repair permissions)

cd /Volumes/Leopard/System/Library
chown -R root:wheel Extensions/AppleNForceATA.kext
chmod -R 755 Extensions/AppleNForceATA.kext

(clean cache)

rm /Volumes/Leopard/System/Library/Extensions.kextcache
rm /Volumes/Leopard/System/Library/Extensions.mkext
kextcache -k /Volumes/Leopard/System/Library/Extensions

That's it. Remove DVD and restart.

---