Those insmods are required to access an ext2 filesystem; if they failed because you they're already loaded, you're cool; otherwise, you need to get them working first.

You say you untarred into /initfs/, but you said your second partition (I assume it's ext2, but don't know) is on /extfs/ ?

You may need to change bootmenu.conf; look at it and see if it conforms to your system.