I made a stargate mesh, its not the best, but its free and gives you guys something to with. I found it very hard to get my hands on a decent stargate (especially one that's compatible with anim8or). So here's a free one. I'll upload it something later today, as its on my other pc. here's a screenie tough:
edit: i just looked at this img and its quite old. i rebuilt the mesh in the meantime. it looks better like the original one. and it has a thicker inner circle (this one is quite thin).