A turtle is an amphibian, not a lizard. Save the Giant turtle for the frogmen faction. Make that faction cool and different from WHFB. I think Ral Partha had a turtle with a ballista on its back, which, IMHO would be freakin' awesome!
Now I'm going to check out those Naga vikings, perhaps they will obviate this comment.
Okay, I just checked it out, and it is totally cool, and has my vote for next faction for serious development consideration.

Well, as soon as they mount a ballista on the back of the Turtle.
