Finally! I have something to do HIL testing
I think we can use this for balloon drop missions as well as sub-orbital HIL testing. I can run it in X-Plane 9 now so I hope we can get it going for FlightGear it's a bit harder to do in FlightGear.
I'll post a video of a mission as soon as I clean up the rocket's looks :) It took a long time to get this far by myself. (with a lot of help looking at others work here)