Im in Lower Hutt. We had a bumper "crop" as well. At least 200 or more caterpillars, we gave away at least 80+ to our neighbours and sister living in Mt Victoria. Currently we have 100 chrysalises and 10-15 medium to large caterpillers munching the last of our plants/pumpkin shavings.
Came home from work today and had first butterfly hatch, a beautiful female, I put her on a plant outside and within 5 minutes a male dive-bombed her and carried her away! 20 more chrysalises very dark and will probably hatch tomrrow first thing.