I'd fish out of the boat some before putting any time and money in it. I had a 14/42 jon boat at one point, and it's fine for sitting, but it was fairly unstable.
I live on ~130 acre electric only lake, and have a 15/48 jon boat that I've added a deck extension, lighting, rod holders etc. It's much more stable than the older boat and enables me to stand on the front deck while fishing.