I guess stepping away from the Dodge for a while allowed me to think about it a bit clearer. Things have started up again! I've pulled out the L300 Stub axles and replaced them with the L200 stub axles. The discs and calipers from the L300 fitted straight on to the L200 stubs. The commodore rack and pinion appears to be about the right length, so hopefully no modifications needed there. The only thing I need to do now is ream out the holes on the steering arms to suit the commodore tie rod ends.