Split the baguettes.
Cut tofu into strips and place into a bowl with barbecue sauce to soak while you prep other ingredients.
Cut carrots into thick matchsticks, cucumbers and daikon (if using fresh) into large thick rectangles, and tear up watercress and cilantro. Arrange in any order you like on baguettes.
Fry tofu slices till crispy. It is not necessary to put them into barbecue sauce, just fry them and they will be more like "egg" in "Banh Mi Trung". The barbecued version will be more like "Banh Mi Thit Nuong".
Arrange tofu on top of vegetables. Now the fun part! Douse inside of baguette with sauce of your choice. Maggi Sauce is like.... sweet thick extra salty soy sauce, common on these sandwich. Sri Racha is very hot garlic sauce.
You could potentially put all sorts of things on this sandwich, just make sure to leave interesting and distinct texture between ingredients.