yes did you remake the extensions.mkext file after you add your kext to the extensions folder of the iso

here is what you do
if you are in leopard (have to be in leopard or tiger)
move the whole kalway folder to the desktop
in the folder there should be the iso file, the folder where you add the kext with the command file
put your kext file that you want to add into the folder with the command file
open up terminal type sudo -s (put in your password)
drop the .command file into terminal and it does it all for you
than burn the iso with disk utility