...Hi Frank...
A wee suggestion that might help you in your search for plans...
If you find out where the "BROCKLEBANK" was last dry-docked, The shipyard should have a set of plans for setting up the blocks in the dry-dock bottom for the boat to sit on.
There are also several plans services who have loads of plans for sale, mostly of older type vessels...
Anyway Frank, Good luck with your build & dont forget to post regular updates of progress...
...All The Best...Norry...