Just a quick addendum - nuclear artillery shells were definitely designed by Dr Gerald Bull (the designer of the G5 and subsequently the Iraqi Supergun).
When you say timers, Vonkprop, then you're talking about the kryton switches - things that look like glass spiders?
Don't agree with you about the rocket fuel theory ... simply because it wouldn't have merited the response by the Americans that happened. Only something super-super sensitive would have done that.
The Unteleported Man, the Israelis gave the guidance system to the South Africans (almost certainly with Ronnie's blessing) but having lost it would have been desperately keen to recover it again before any wreckage recovery effort - not so much from the point of fiew of the Sovs nabbing it, but someone spotting it and saying "hang on, that's the guidance system off a US xxx missile ... what's it doing going to SA?" Given that the Iran Contra hearings were on at that time, such accusations would have resulted in the impeachment of many senior Republicans.