..... and then I found out, with the type 82 reference, that my new Ikara was too big and PB's was too small...... I might update this post with an new drawing later today, including the magazine of course (if it is done, it is best done good)
EDIT: first one, more to come after a bit of research, but all australian fits should have the same handling room but an different magazine possible...... and then I start further research on the RN Ikara layout (any help is welcome)
EDIT 2: the perth seems to have had an shorter, but wider arrangement. I suspect an handling room for each launcher and an magazine in between, as the funnel crosses exactly the space that would otherwise have been magazine.