First off, Welcome to the best GM truck web site on the net, bar none.
And we always welcome pictures of trucks and on going builds.
Another thing to consider besides the mentioned parts suppliers is to become a dues paying member. Best $25 a year US currency you will EVER spend on your truck. There are a LOT of good quality parts selling members here, several have some high quality NOS items. Being in the Land Down Under shipping will NOT be your friend unless you have a US address you can use then relay somehow to Australia.
Also, a nod for Wes at Classic Heartbeat, the man KNOWS his trucks. Have used him and GMC Paul both with great results.