I believe the easiest approach, if I decide it needs help, is to mix up a little "bondo", tape the edge of the corner pieces, and lay on a tapered layer back a couple of inches. The other idea that I had was to cut a 3/4" or 1" wide strip of the thin plywood and glue it to the panel that's proud, forming an overlay to cover the joint. I kind of like that idea, but it's still a big IF right now.
Back out this morning and got the second corner trimmed to fit then drilled for clips and got them both mounted. Like I said, I may do a bit of filling, but in truth these pieces are going to be tucked tight behind the seats, which are all the way back for me. We'll see.
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Attachment 74115
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The door panels are near flat, except for the top corner at the hinge side where it tips in about 1/2", enough to keep trim clips from pulling the panel flush. With the success of the corners I decided to try the same thing on the bend and made a few cuts on the back side.
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Attachment 74116
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With a couple of strips of 1/2" plywood under the panel I clamped the corner to the bench....
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Attachment 74117
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...and glassed the back side. Worst case is cutting a new panel.
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Attachment 74118
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But it worked!
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Attachment 74120
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I got the second door panel taped in place to be marked & trimmed to final size, then it will get drilled for clips. Both kick panels also got a bit of backside relief to ease the curves a bit, and they should be in place tomorrow, too, then put the seats back in place and visit the stitcher about seat upholstery, and see if he wants to do panels and carpet too.