You can certainly see where the sun has been hitting the hull for many years, since other places seem fine.
A new hull would definitely be best.
However, it depends on how pretty you want it to look. I would probably try to make a "Francenboat" out of it with a gallon+ of resin then colored gelcoat. You could never split the hull again. Of course it depends on what the inside mechanicals look like. But, I'm not afraid of DI's, and would accept the challenge.