Thought I'd update this with the current rims I'm using. GPM rims from Asiatees.com
Fronts being driven are just half of a rear set with the hub put over the nut and left over threaded shaft sticking out. cleans it up nice.
Rears are just put together. each bolt around the outside does hold the two rims together! I opted not to have the cover over the rear drive nuts. I did have the RC4WD true scale nuts that made it looks like real hubs but they keep coming loose on me.. dunno why. So easy access to the hubs was needed. still looks okay to me. just not as bling bling.