Johnny,
I dont think the selenium fat jars (or the standalones as they are called) are getting published to Maven Central.
So downloading a jar from Maven central and then trying to run a selenium grid is not going to work for you.
Once you have the fat jar, you should be able to spin off a Hub and a node like how you have always done it.
Thanks & Regards
Krishnan Mahadevan
"All the desirable things in life are either illegal, expensive, fattening or in love with someone else!"
My Scribblings @ http://wakened-cognition.blogspot.com/