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Miguel, it was an interesting observation that you made.
The good thing is that amateur astronomers can now make these sorts of observations with affordable equipment.
It may be that, after making further observations of various Supernova Remnants and Planetary Nebulae, you might (or might not) modify your conclusions;
but the question of the spatial distribution of [OIII] emission vs. H-alpha emission is certainly worth thinking about......so perhaps you can find some more observational support for your interesting hypothesis. A scientific hypothesis can be either 'strong' or 'weak', depending upon the amount of observational support, so an informed conjecture or idea, even if later proved to be partly wrong, is still worthwhile. [ After all, Galileo claimed that Venus showed phases, somewhat before he was able to see the phases clearly in his telescope; and he later proved that the planet does show phases!! ]
I will shortly contribute some more info regarding the spectral lines emitted by SNRs in the optical regime, and their mechanisms of causation. I have some experience with stellar spectra, but much less with nebular spectra, however I will do my best!
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