Hi Ian,
Looking good fella, I do love a good looking Stuka, and this is a damned good looking Stuka,
When building a dio i usually ask myself how the 'subject' got to where it is, and what am i wanting to show the viewer, does the dio tell a story ?.. so maybe you could start from there and add things to help you tell that story.
So if i may suggest, maybe you could bend the remaining props to replicate the damage that would be caused by them spinning as it hit the deck, and possibly flatten the lower nose/engine cowling as it would probably crumple upon impact..
Possibly add some more damage like canon shell hits to show the viewer the cause for the crashed aircraft, also if it's possible could you add any frame work into the broken tail section, to show the aircraft's skeleton covered by the outer skin,
And maybe you could add some kind of additions to the groundwork..like the odd bush or two.
Like Steve has posted above maybe you could add a body, or if not a body then maybe a bundle of cloth to replicate a discarded parachute, ..(i'm thinking that the pilot and gunner have bailed out, and walked back to the downed aircraft to grab and survival kit/ rations..etc, before wandering off into the desert in hope of rescue..)
Excuse my ramblings, i'm having a brain-storm after seeing this.
Looking forward to seeing more of this as it nears the finish line..