Have you ever seen the cockpit of this one? Amazing! But I never built it. I just made the exterior of it. And the purpuse of that, was to be used as the Nasa version, to lauch the X15. I saw that working in XPlane9, but I never saw it correctly working in XP10 or XP11. Maybe they have included back that feature? I don't know, but I would love to see deeper mission system in future Xplane to see this baby fly in future XPlane12.
I loved to make the PBR material for this one in XPlane11. So shiny! 
What it was very difficult for me to work in, was the Landing gear system. Have you ever seen it (video down these lines). It was the most difficult landing gear animation I have ever made to any plane for xplane. Why I never did a C172? LANDING GEARS ANIMATIONS!!!!!