I don't know about kim steele tables, but I did hear that Pinnacle tables had some relationship to the folks who started Diamond. I can not verify that as accurate however. Real King Cobra would probably know.
I looked at a couple Pinnacle commercial tables and they were very nice and heavy duty. Big Dog's in Desmoines had one in the front, not sure if they still do. They did have some similarities to Diamond tables. I posted a pic of one on here, let me see if I can find it...
yep, there it is. http://forums.azbilliards.com/showthread.php?t=30166&highlight=pinnacle