Switch back to layer 1 and press the \ key to unhide polys. Hold shife and click on layer 2 You should have something like shown.

Select layer 3 and put layer 2 in the background. Here is where you can get really creative. I didn't. I made a disk centered on the X and Y axis.

Give it a surface name like hub.

Dress it up the way you feel is right. All I did was a series of bevels to the outer poly to give it a bit of shape. When I was finished I gace the center poly a new surface called Emblem so I could put a bump map or something on it later when its rendered.