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The way I would construct the kamm-back would be to use regular fir 2x2s or 2x4s...make a frame and shape it to the rear hatch glass. Then the wood frame could be extended out in the shape wanted. If I use several coats of thinned polyurethane on the wood...this seals it against weather. Sand the wood lightly...clean the glass with lacquer thinner...glue it on with the old style silicone caulk (acetic acid cure). The shape could be covered with alum sheet...acrylic?
Sides could be acrylic...top alum.
The lip is sheetmetal...would need to be worked around. Would just continue the current overall roof shape on top...sides would be best aero-wise if they angled in some...trying to follow the established curve to some extent at the tail lights? Sort of a half boat tail.
Rear view would be reduced? Not sure what it would look like.
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