Preheat the oven to 390°F (200°C).
Add a thin layer of marinara sauce to the bottom of a deep 9x13 baking dish.
Then add 4 sheets of spinach lasagna noodles.
Then add half the vegan bolognese and spread it into an even layer.
Then add a thin layer of vegan cheese sauce.
Then add a layer of sliced zucchini.
Then add all the vegan ricotta into one thick layer.
Then add 4 sheets of spinach lasagna noodles.
Then add another layer of marinara sauce.
Then add another thin layer of vegan cheese sauce, leaving the remainder to add on last.
Then add the rest of the vegan bolognese.
Then add a layer of sliced zucchini.
Then add another 4 sheets of spinach lasagna noodles.
Then add another layer of marinara, leaving a small amount behind for decorating the top.