That's not a great view of the BoB "Proctuka"
There's a much better broadside one in June's Flypast
IIRC, and from that quarter it looks FAR better. I'll have to find it again and scan it....
HOWEVER - the film story doesn't end there....
Lat moth Aeroplane
published a LOT of previously unseen background stills from the production...including one of a REAL Stuka!
On the ground at one of the airfields they used. There has been a persistent rumour that MacHaddie did find one and they DID try to restore it to flying condition....but as we know it was never used - so I presume the attempt failed. However, they DO seem to have got the engine running; although the prop is stationary in the still pic...there's a battery trolley and a fuel container sitting beside the aircraft... I'll have to find that copy again too, the sidebar to the pic IIRC had the provenance of the aircraft and its werk nummer.