Nice pictures! Thanks for documenting all of that. I like seeing the step by step. You might be interested in this blog post about how to craft a veggie burger. The method this person uses is to pick a base from Legumes: Chickpeas, black beans, kidney beans, red lentils, etc. Veggies: Corn, zucchini, beets, sweet potato, mushrooms, etc. Nuts/seeds: Cashews, walnuts, pine nuts, pumpkin seeds, sunflower seeds, almonds, etc. then create texture, pick a binder (generally beans but can also be a flax egg etc) then add herbs and spices. The author has a lot of options for all of these steps in the article. There are a lot of options, so your meatloaf can get as creative as you like it to be.Grains: Oats, rice, millet, quinoa, whole grain bread, bread crumbs, etc.