Using Miles For Flights In Australia

I booked my brother to Sydney on a trip that includes a stop in NRT and a 23 hour lay over in Seoul.  Luckily he's excited to tour the DMZ and the USO offers regular tours.  Once he gets to Australia, moving around is much easier.  Qantas has great domestic award ticket space, especially between Sydney and Melbourne.  American miles work on Qantas, but the pricing is not great (10,000 in back or 17,500 up front).  I'll be using British Airways miles instead because they price by distance, so SYD-MEL is only 4,500 miles in coach or 9,000 in business (includes lounge access too).  This has the makings of a fun trip.

Qantas 747 at NRT