dude, that sounds awsome. as for location, you guys are all just winging, even though perth is all spread out, it only takes 40 mins max to get from one side to the other. the other thing is, due to the topography of perth, being on the coastal plain at the bottom of a plateau which extends eastward to the blue mountains, there aint much in the way of hills. the only place to stick it would be in the foothills out kalamunda way, otherwise kings park would be a good place to make it, if it wern't crown land. the BEST option the way i see it, is if someone knows anybody who has a farm somewhere in the hills that hasnt been cleared of vegetation and is on decent hill, we kindly ask them to let us use it.
also, just as a quick sidenote, i reckon there should be a small trials section somewhere, for us riders who like to hop.