It'll need to be built from heat treated wood or fumigated to clear Quarantine in Australia as well...not your issue of course, just something for the buyer to keep in mind.

I just finished loading 5 containers or could have helped get it to the Melbourne area for you at least.

If it's going by container, just shrink wrapped and crated up 'openly' is fine. Closing it completely in with plywood would be fine too, but it never matters to me personally.

If you were going to send it via air, not sure if they want it closed up or not..