From: Ocatillo Land
Picking this up a little late, but Pioneers weren't unique to the Australian Army, they were a standard Commonwealth formation, see http://www.royalpioneercorps.co.uk/rpc/history_main2.htm
"The Corps at its peak in May 1945 was probably the largest Corps in the Army. It included 12,000 Officers, 166,000 British Personnel and 400,000 Commonwealth Personnel. As well as being responsible for a civilian labour force of 1,074,000 and a Prisoner of war force of 173,000."
I paid a lot of attention to JeffK's comments and went and got some WE tables from UK, Aus, NZ, for them. They list carpenters, brick layers, welders, and all. They could obviously build things so I made mine as Eng squads but they weren't equiped to take out forts so their anti-armor reflects that. The weapon list was about the same as for infantry, and they were often used as infantry. But they weren't trained as infantry so their anti-soft is a bit less than an equivalent infantry unit. That means that Commonwealth formations have mostly puny 252 and 253 Eng units representing their Field and Field Park Coys and some Pioneer units in their operating brigades. No combat engineer Rambos like in US units.
Of course can modify things if someone sends a wake up call.