Drawings of German WWII torpedo tubes

[DrSchmidt]

For my cut away, staticType XXIII project I'm looking for drawings of German torpedo tubes. The ones built into Type VII, IX, XXI and XXIII were pretty much the same. There are plenty of good photos around, but I haven't found any drawings that would allow to put dimensions on the various components. Did anyone of you guys stumble across such rare gems?

Cheers Andreas