The question is also whether you have someone near you that can repair them correctly or not. If I had to repair these in CA I would scrap the hulls and keep the rest of the good parts and put towards another set of hulls. These boats are out there you just have to look. (sorry guys, just MHO) Just in the last 8 months I purchased two sets of hulls. One for $300 and the other for $500. One set was the best set of hulls I have ever come across and they were 30 years old.
Most likely there are other soft spots as well and you could be chasing this thing for some time and $$$$$$$.
Reboot and find something you can sail in the spring. The $$ you will put into this could go toward some clean hulls and many years of enjoyment instead of worry, work and time not on the water.
For your future reference, my experience has shown me that the yellow and blue hulls of the 70's and 80's do not stand up well compared to the white ones of the same era. (blue ones were the worst). Your yellow hulls show more beach wear than delam issues but my point is still valid. These boats are old and the white hulls must have not been effected by the heat as much as the other colors.
The good part about this is.............you know what to look for next time.