Earth oven construction

Now that my creative son is living almost full time at the oasis, he decided to make a pizza oven (horno or earh oven).  It's a lot of hard work. Here's a link to a short video of him making the clay coating from the clay on our big hill. (I think you can click side arrows to see more of them.)

https://photos.google.com/share/AF1QipMgboVZ6Iy-eF-Rgp4TXXa-X6llm_FTbW3JT-sKCVcANbjVAx5JezMoiJoCUIU5aw/photo/AF1QipOjVtkDqsICJ3K-CWwDlhluzjWUb95wM-suM4pY?key=SnFKMlBkTHBzUVlvR2RDOEFRckVQSkNuRERBa3NR

I know nothing about earth ovens. I hope it works good for him. It's not done yet, but here's how it looked when I last saw it. I'll post photos of it when it's done and in use.

The hybrid Anna's x Rufous Hummingbird is still visiting my feeders in Alpine, going on two months now. Otherwise, nothing going on. Might be a long winter ahead if wintering birds avoid this drought-ridden region.