Re: Question
Yeah! Scaring me too! It would be OK to use turnbuckles to draw it in while the re-gluing job you will do is setting-up, but then the re-screwing job should take the turnbuckle's place.
As a permanent solution, the turnbuckles will, at the very least, look amateurish and unprofessional, and will reduce the value of the hull.
Depending upon your hull, a wood boat in good condition is desireable and can command a good price. Properly done repairs will help it keep its value. They may take a little extra effort but in the end, you can be proud of your work.