Thanks for all the suggestions (and Bacicat for your offer).
I was lucky with the holes, and the water turned them into butter for the hand borer.
After chatting to the guys at the local rural supplies place I ended up getting some 50mm square "project mesh" and will just staple that onto 75x50 rails. Its a bit heavier than chicken wire and pretty much self supporting, the rails are cheap and I didn't have to mess around with heavier strainer posts and tensioning wires. Probably not economic for a long run but I think has worked out OK for this one.
Posts and rails are all done, and I should have the mesh on tomorrow after work. Turned out my 100x100 Bunnings posts were actually H4 treated.
I've also realised its a bit embarrassing asking for fence advice for such a tiny bit of fencing, when real blokes are running out hundreds of metres at a time and would have got mine done before lunch 
Steve
1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
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