mkdir /tmp/newcd
(cd /mnt/cdrom && tar -cf - .)|(cd /tmp/newcd && tar -xvf -)
cp -a ks.cfg /tmp/newcd
cd /tmp/newcd
mkisofs \
-A "Red Hat Linux/i386 7.3" \
-V "Red Hat Linux/i386 7.3" \
-J -R -v -T \
-x ./lost+found \
-o /tmp/newcd.iso \
-b dosutils/autoboot/cdboot.img \
-c boot.cat \
.
I took a win98 boot floppy + HP ROM upgrade Service Pack (SP) + boot.cat from a Red Hat Linux 7.3 CD #1 and used the mkisofs command to make a bootable cd: