He needed at least three times as much for a durable, waterproof roof. The wattle and daub construction has been around since the Bronze Age, at least, examples have been excavated at that level. Daub is usually a mixture of mud and dung, cow dung making it somewhat waterproof. Straight mud walls need remudding after every rainy season, local adobe constructed houses do. They use chicken wire over the houses at Taos Pueblo to try to hold the adobe plaster against the bricks a little longer, pretty slick of them.
Those beautiful Tudor buildings in the UK with their visible half timbers have walls made of wattle and daub. Once they got fireplaces and glass windows, those houses were much cozier than the stone castles and monasteries of the two parallel aristocracies. And no, you can't smell the cow shit once it's dry.
In the early colonial period in the US, chimneys were on one wall and made of wattle and daub. If you were lucky, you were awake when they finally caught fire and escaped with your lives. This guy built a fire inside his hut, nice way to coat your lungs and the interior walls with creosote, Einstein. The only way to survive an interior open fire is to have cross ventilation---or a really big space. An external, unattached fireplace might have made more sense, it doesn't look like he's in a cold climate. Leaving the upper 6 inches of wattle undaubed would also have allowed more of the smoke to escape.
Other than that, it's not badly done.
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