Wacky Mate
I've already replied this on the modelwarships.com forum, so I might as well post it here too (lol). Go to the RAN website, cos they have detailed ship plans for every ship/sub that ever served in our Navy. Unforturnately, the Navy has just recently redesigned their webpage, so I cant find them. Not to worry, just email the Navy website and ask them if they have any on records. They will be only too happy to help, cos I've asked for stuff before (you may have to part with some dosh to access them though - lol).
happy building mate!