Foreman Smart Proxy Development Instance

I am fairly new to foreman and I am trying to use vagrant to spin up two Centos7 boxes for development, one for foreman development and one for smart proxy development. I have already created and spun up the box for foreman, but I am not sure how to set up the box for smart proxy. (If it helps, I am using foreman’s forklift repository on git)

Expected outcome:
A vagrant instantiated centos7 box that is set up for smart proxy development and can communicate with my foreman box.