Just came across this on the net. Roman Dial, the guy who literally wrote the book on packrafting was recently in Tas (he might still be). There is a great report and video on his blog about a trip down the Anne River. He was going on to tackle the Franklin after that. His description of Tassie scrub is classic.
One thing I got from the video was that those Alpacka boats are really tough little beasts. If they can survive all that scraping over rocks and scrub they are solidy built.
Enjoy!
Alliecat