I can answer a few,
The Clan Chat we use is Wilderness Guardians
DG and WG are interlinked by that, so we have 1 citadel.
We still follow Arpk rules, but they have been modified up to date. Example the new rule is in the wilderness we can kill non skulled
in the rev caves due to the little action in P2P we will need something to kill. "i think"
I couldn't see why you couldnt come to certain raids, i'm not sure about aussie you'd have to ask staff about that sorry (i haven't been as active lately), i haven't been to one in a long time.
Activity, DG: Just started up, and WG have no access to certain DG boards and visa versa, so again i couldn't really help. THey seem good guys in DG and i see them in game when im on.
WG: Well just had a forum move, so it's not at it's best, but just wait for everything to settle down and for some people to come back from holiday/temp activity and we should be clear.
Thats all i can answer

Don't quote me fully on this. It may be best to Drop His Lordship a PM