He's probably thinking of mechjeb's "brain" that sits behind the panels that open on the old mechjeb inline parts, along with the partacle effects. I agree that it would be interesting to see a mechjeb "brain" mounted, unshielded, to the inside of your struts (maybe even make that an unmanned pod?). (Example) Actually, on the topic of pods... Now that it's possible to see inside the pod (correct me if I'm wrong), would you consider making a pod or two to go with your trusses that's just a seat/seats inside a frame/roll cage? Multiple sizes of both flight(rockets behind pilot) and lander(rockets below pilot) oriented pods sound quite useful, the first to make something like a space tug (or jury rigged interplanetary craft), and the second for open cab landers. (Example) The landers would be made even better with a short fuel tank, maybe the size of the rcs tank, and short landing engines (maybe radial engines made for 3x symmetry to lign up with your trusses), though they aren't priorities. (You can see what your existing parts look like in the mechjeb shots)