You seem to be just the man to draw the real SMS Gefion, aren't you??
Someone did spot the inspiration
The issue is that the few linedrawings
of Gefion that I've seen are honestly hideous in quality and hardly worthy to be called that (I won't bet much on their accuracy). As long as they are a reference to an AU design that can be whatever from a modified real design or a completely unrelated one it's fine. But for a real ship it does not quite fit my bill.