Seems like there is no snag anymore. Can "normal size" 6.5 inch drivers be fitted flush in the doors and without hacking up anything? Yes, it can be done. The only permanent modification that had to be done were four holes in the door panel in the speaker opening,
Speaker opening with new mounting rings. I think it is actually hard to tell this is not stock, the only give away is lack of the metal stubs where the OEM speakers mount.
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Morel driver, with passive crossover and 100Hz high pass filter to keep sound clear and distortion and rattles at bay.
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The driver wired up and installed in the door, seems like it fits real good and thin spacer assures good seal with the door panel, the OEM driver appeared to have some air leaks around it.
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And with OEM grill, seems pretty flush to me and looks completely stock, except for Morel logo on the driver. I left it visible on purpose. I made little plugs to cover the screw holes, seems to look pretty good to me.
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And passenger side tweeters installed. With the OEM grill on, looks fully stock.
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Since it got pretty toasty in my garage, I'll do the driver side tomorrow.