See here for my SH4 Jap Recog manual:
http://www.subsim.com/radioroom/showthread.php?t=111339
And here for Krupp's Jap Ship Dimension Fix:
http://www.subsim.com/radioroom/showthread.php?t=109953
I would be happy to produce a version of my manual with the shaded target areas, if someone will provide the information.
Many of the in-game ship dimensions are wrong - get Krupp's fix for that.