You Aussies get the long end of the stick with
GW, but you don't want to know where they shove it
There's persisting rumors of plastic Meganobz from
GW sometime in the future. Honestly, right now your best bet is to get plastic Nobz from an American seller (with shipping it will be cheaper than Australian retail) then convert up your own mega armor using plasticard and Ork bitz. The Terminator-
MANZ conversions never look terribly good to me, due to the proportions of the Orks vs. the Terminators.