“We have enough clay in the soil to do it”
That’s really great, making your own bricks.
I have some historic furnace bricks from a steamship I have wanted to make into a brick oven. Right now they make up a loose bricked brush burner. I don’t think I would use it enough as an oven to justify that construction. I set my brush burner up so it can be used as a whole hog or whole chicken ranch BBQ
Here’s a homemade do-it-yourself outdoors cheap build wood burning brick oven.
https://www.youtube.com/watch?v=tHMQ_QQJtbY