The government has not shared a draft of the voice model, and says concrete details about how many people sit on it, how they are selected and how the voice would interact with parliament would be decided first through further consultation with Indigenous communities after the referendum, and then changed or amended over time by the parliament of the day.
I honestly think this is one of the biggest strategic errors they've made. It plays right into the hands of the fearmongers, by letting them imagine a world where the Voice has more power than it really does, and by letting them wedge people who would otherwise be supportive by claiming it won't adequately represent Indigenous people of all groups. It doesn't matter if these claims are untrue; by not having a specific plan available, people on the fence are more likely to fill in the gaps with the worst image their imagination can conjure up.