I just re-read the post about crew weights yesterday, and he said for the smaller boat the crew weight would range from 31 to 50 kg, with 43 kg being optimal.

For the bigger boat, crew weight range is 49-72 kg, with 63 kg being optimal.

Keep in mind that only applies to his particular design and is not necessarily true of other designs. It sounds like the Australian boats carry a lot more weight than that.