Center Platform (Update 2)

Here is probably close to the final design on the center platform.

 

Using the inverted radar dish on a small turntable, I have created a small remote controlled laser cannon.  Still need some more sand green slope parts to finish this detail and then duplicate on the other side.  Here is a closeup view

Also looking at whether the spotlights or a rotating laser cannon makes sense on the top structure.  Here is what that looks like.

I don't have another structure that the under carriage type laser cannon really fits. But at the same time the spotlight fits the purpose more.