Agreed that you need to dig into it a little bit to see how bad it is. Turning the motor mounts will give you one piece of information. You can drill some pilot holes in various spots of the stringers and get an idea of what the wood is like. Once you do, you will want to evaluate whether you want to keep the boat for a while or not. You can do the stringer job yourself and there are lots of threads on here with great ideas. Plan on several hundred man hours and a few thousand dollars and you'll be good. You can also look at having it done for you which should cost more like $5-8k. Definitely post more pictures and provide more details. Lots of us on here can provide good feedback.