That is an model... if you want an animated one, like the Blizzard's, making a model like that would be a hell lotta work. So, if you don't have any modeling experience, making your own loading screen would be impossible atm, unless you get someone to do it for ya.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.