@amigadave
for OS4 you can't really do it, OS4 would require a new loader to load the kernel modules resident into the Deneb flash.
For OS 3.x you should add smartfilesystem (if you use it) poseidon usb, and any blizkick modules you want, and the OS 3.9BB2 rom-updates. You may also want to add the newer patches that AmiKit uses.