Container costings
To ship my RV kit over in boxes, sans engine and prop, will cost ~ $3,500 AUD - they package it with other kits to bring the individual cost down.
Have a look at Aussie Car Imports, they're most likely going to do mine and have done a few shipments of already-built airplanes lately too, I believe.
And according to the KRviatrix, aircraft <2000kg MTOW and aircraft parts for these planes are duty-free, under section 88 of the Customs act. Gotta love having a beancounter as a missus.