Creating starbases?

This questions probably makes me an idiot, but to hell with it because I can't seem to figure it out.  I got the entrenchment expansion, it's installed correctly (I think) and loads properly.  I've researched the Heavy Constructors in the defense research tree.  But I don't know what's supposed to happen from there.  No heavy constructors are appearing at any of my planets and I don't see a way to build any.  So, the question: what am I missing?

Thanks!

Edit: This is the wrong category and to prove my ineptness with anything software related, I don't see a way of moving it to the Sins of a Solar Empire category.  Could an admin please move this for me?  Thank  you.