I think post-apocalyptic settings are appropriate for an airsoft larp. Nice to costume, workable technology levels, etc. I’ve heard a lot of nice things about the Fallout setting but never actually played the game. But the costumes above do demonstrate how having a strong artistic inspiration can make for cool gear.
I wonder what venue in Auckland would be appropriate for post-apocalyptic? Those Russians look like they got lucky with all those concrete bunkers. The only locations we have like that, for instance North Head, are open to the public. One alternative might be a container town in the style of System Danmarc, though I don’t know how they got so many old containers, they seem to cost around $2k each second hand. Renting them might be an option if it was a one-off event, 20ft containers are about $100/month each.
EDIT: or a tent-town with army tents.