Pat H said:
it depends on the people who ride the track, if they dont care about the effort you have put into the track then they'll rip it up, and wreck the actual trail without fixing it?? in terms of the illegal issue, ring up your local council
If you want to build in a National park, the correct people to get a 'no' from would be the national Parks and Wildlife Service (in NSW).
Councils will control council land.
You'll have better chances of getting permission in a state forest and on council land, particularly if you don't intent to use any north shore.
Even if you want to build some north shore in your backyard, you'll still need to ge ta permit form the council.
Might be worth making friends with a landowner of a large area of undeveloped bushland and getting em a few cases of beer.
And yes, all land is owned by someone. If you decided to build illegally,on publically owned land, how soon your structures will be ripped down would depend on the management agency. In order of soonest to latest.....
council
national park
state forest
crown land managed by the department of lands