I would still continue contacting the manf and maybe they might possibly make concessions with you on your boat. Alumacraft is a good boat, but it is disheartening to hear this on this boat.
I wouldn’t give up yet, since I think a good welder could easily repair boat. Unfortunately, I think you’re way off on pricing on what your hull will bring. I think if you’re lucky you might get 3k and that would have to be the perfect buyer. I think realistically you have a 2k Hull in that condition. That is why I wouldn’t throw in the towel yet and consider all my options
I hope it works out for you and you shouldn’t be dealing with this situation especially what these boats cost these days. Take care my friend.