Honestly I think this is a standard design, all Kumbak trains have the same kind of feel to them. I never thought this was custom to fit a theme, but maybe you guys are right.
About Stampida as the whole, as surprising as it may be to some people, I really enjoyed my rides on it (with those exact trains). It is rough, yes, but has some much potential! I'm really happy with the retracking.
The starta looks cool as well, even if I really don't get that tiny hump.