Just a lucky find,
I managed to get a copy of Anatomy of the ship 'The type VII U-Boat' for £6 from Amazon. I'd already decided on U-69 before this, so how pleased was i when the book turned up to see a very clear photo of U-69 in dry dock!
The book is crammed full of line drawings of most aspects of the type VII and is a real must for anyone building Revell's giant. There are some confusing drawings in the book as to what type and where these vents should be, so i just copied mine off the real boat
Sav.