I would say that it's worth around $3,500 to $6,500 Max. I wouldn't go any higher. I don't know all the details of the boat but I did look at the pictures. I think $5,000 is probably a fair price and you should be able to sell it for the same price when you are done if it still floats and runs.
I would need to know more in order to give you a firm answer.
The boat is not a competition Bow Fishing boat. But it will make a fine personal starter boat that you can bowfish of off in my opinion. You gotta start somewhere. Good Luck