I humbly suggest you elope. You'll save the money you would have spent and you'll save the hassle of food. But if you do decide to do the 50 people wedding, seeing it's going to be at a cabin in the woods how about chili with cornbread, a huge salad, and a gluten-free wedding cake? If you ask others to bring something you KNOW there will be CC at best or downright gluten ingredients at worst.
To save money you could even make the chili a vegetarian type. But even if you decide to put meat in it you won't need that much.