Perth is currently served by 787 and is not a RSP (Reverse scheduling point). You can base yourself anywhere in the world however CSA will only position you from a CSA destination. Travel between your home and the CSA destination /port will be at your own expense as there is no ID90 travel. If based in CAN on 20/10 all travel is during the 10 day off period. However with annual leave etc some guys seem to be doing 18/12 etc, others back to back 20/10/10/20. Crews in RSP seem quite happy with there roster /days off. CSA appear to be at least trying to make it work as best as possible. ...It's different and fun will suit some but not others !