skinnies, ramps, junps and banked corners

Elevated trails with skinnies are generally referred to as NS (North Sore)

Not much legal in Aus as yet. So you are unlikely to get too many directions over the net

It developed in Canada where they had an abundance of "blow down" fallen trees and boggy ground to traverse so elevated trails made from the fallen trees was a good solution. Australia hasn't got many places where this is relevant other than it can be fun.

Unfortunately a lot of the would be copy cat builders here don't take the time and effort to do make the things properly...

All that said where are you located?

The Lidsdale xc loop near Lithgow has a few small obstacles such as this

http://youtu.be/2wvSBZh2804

There is a little bit of North Shore, berms, ramps, jumps plus some skinnies around the area and these can be found at the locations listed in the "Rides" section of this site. It may not be in the quantities that you're used to but they are around.

You will probably find that many people don't broadcast these locations on the internet due to them becoming overrun with muppetts (idiots - not the little furry colourful things, although you do occasionally get those as well).

There was a fair bit of woodwork at Oxford Falls however the locals apparently removed it probably based (at least in part) on the fact that some of those who chose to ride the area were inconsiderate of the local residents (shouting, playing loud music, infringing on people's property - all of which I might add I recently witnessed at the Lady Penryhn Drive entrance to Red Hill).

Best way to find details of new tracks is to join the organised groups on this site and/or just speak with riders out on the track.