My main concerns with that boat would be waterlogged/saturated floatation foam and a rotten transom.
Just in the small pic I see quite a few holes and penetrations (red) that will allow water intrusion:
The weathered hatch and the signs of standing water in the stern (yellow) tells me this boat hasn't been kept covered.
Just because the owner
says he's been over the boat from stem to stern doesn't mean diddly-squat, why can I see holes if he's been over the boat? I'm pretty sure all he's done is prep it for a quick sale.
The more I look at and think about this boat, and the ones I've seen like it in the restoration forum... the more I think this boat is going to have issues that will require considerable time and money invested in the hull.