That's how I display and play with mine:
http://kupscigar.com/tf/differ.jpg
http://kupscigar.com/tf/differ2.jpg
I also do the same when I display my MP seekers:
http://kupscigar.com/tf3/4-1.jpg
I also like to shift the parts like that for greater leg joint movement and stability for a greater variety of poses. The parts attached to the hips are way too restrictive. The tail fins also add much needed heels when attached to the legs. Also note that you don't have to 'pull out the back wings' to accommodate the hip kibble any more but keep them in place for a more G1 look.