G'Day Dan, being someone who took on one of these projects and didn't know he was biting off more than he really wanted to chew I have some advice and questions.
Dont work the fun and use of the boat around the rebuilding - work the rebuilding around the fishing/boating.
Is the style and size of hull one that you will still want to own in 5 or 10 years because it will be like cutting of your arm selling it after possibly 500 odd hours of blood sweat and tears (yep done each) and besides only fairly classic styles of hull will see you break even if sold.
It is amazingly satisfying if you have a passion for boats and boating but I wouldnt want to ever do it again.
Multiply your common sense estimation both the cost and time by a factor of near 5 because after all the other stuff and sundrys needed to see the job progress are done a factor of 5 might even be an underestimation
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There is heaps more and anyone who finishes one of these could probably write a small book, feel free to email me any questions and if I have come across it and can help I will try.
The internet was my saving resource without it every second step would have been a blind step, check out iboats project boats forum, scream and fly fibreglass forum, fibreglastics and a few others you can search up also that were a continual saving grace including Ausfish, actually the reports section continues to be a big motivational help
.good luck with it, nq