The boat looks like it's in great shape! $2400 is a STEAAAAL! To be perfectly honest, I think $2400 is about the material cost it would take for you to do it yourself. I'm not sure I'd trust that figure (but hopefully it's accurate!)
I think the boat would be worth $7000 - $8500 when it's finished. It looks really clean and well cared for.
Of course, the flip side of the coin is that it's probably worth farrr less than $4500 if you don't repair the stringers.
Former owner of a 1987 Supra Saltare. Current owner of a Malibu 23LSV.