Great news!  I now have a solid direction to go in so I can ramp up the pace, finish the development stage and get manufacturing.  I've decided to make a large universal joint out of steel plate, which will allow the simulator to move through 2DOF - see the video!  (Unfortunately the auto-focus wasn't up to the challenge...)  Now I just need to decide how to mount the fuselage and universal joint onto the main frame.  In the current model I've gone for a pyramid idea, but that may change.