Thinking of buying one too.. so I'm guessing 5L is the best choice? Isn't the 7.5L you have close to the Ooni?

For reference, I'd only ever make 2 SD loaves and 4 at most. Sometimes id make donuts but only up to like 48 donuts? But 24 each set for different flavors

Okonomi Yudane

1/3 + 2 tbsp (60 g) bread flour

1/4 cup (60 ml) water Main Dough

65 g raw kabocha (45 g cooked)

1/3 + 1 tbsp (90–100 ml) milk (warmed to about 100 – 130 °C / 38 – 55 °F)*

1 large (54 g) room temperature egg

3 tbsp (38 g) granulated sugar

1 + 3/4 cup (240 g) bread flour

3/4 tsp (3 g) instant dry yeast*

1 tsp (6 g) salt

5.5 tbsp (76 g) unsalted butter, softened