I'm working on the Impulse deck of my Cutaway model and am trying to get a feel for what's inside Impulse Engineering. I would especially love to hear if Shane Johnson had ideas for Impulse Ingineering. There are APU ejection hatches, which give an idea about the size and position of the fusion reactors We also can see the Intermix shaft crystal and know about how big that shaft is. We can also see windows on both sides of the outer hull, which means that the Rec-room defines Impulse Ingineering to some degree.