Need Advice for Work on a Boat or Should I Sell It

There is a 1982 Duracraft 17 ft. aluminum boat that I can have for free. It was my father in laws and was well cared for until his death in 1998. He gave it to one of his sons but it has stayed in his yard since then, uncovered, cleaned out every now and then, but currently full of leaves and even has a sapling growing in it. From what I can see, it needs to be cleaned out and pressure washed inside and out. The trailer tires need to be replaced, axles greased and possible rewiring of lights. There is no motor on it so I will have to purchase one. It would be fun for my son and I to have to take out, but I am not familiar with the brand of boat. Will this be worth the time and effort including checking the boat for leaks or should I just clean it up and see if I can find a buyer for it? Input will be appreciated.